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Following the conclusion of its WWDC 2020 keynote, Apple released the inaugural beta of macOS 11.0 Big Sur to its registered developers, with a public beta slated to arrive next month. If you’d like to install Big Sur on multiple Mac computers without having to download the installer each time, or just want more flexibility in terms of installing the software, you’ll need to create a bootable installer for the macOS Big Sur beta. Thankfully, this can be accomplished in just a few steps. Follow along with us as we document the step-by-step process for how to create a macOS Big Sur beta bootable installer.
Why do I need a bootable installer?
Jun 01, 2020 You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite. Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac. Apr 24, 2020 It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power. Download macOS Mojave. For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system. Jan 30, 2018 Attempting to download macOS High Sierra from the Mac App Store I found that a small 19 MB version of the “Install macOS High Sierra.app” file downloads to the “Applications” folder, rather than the complete 5.2 GB installer file. That’s the problem.
Having a dedicated macOS Big Sur beta installer created on a USB thumb drive is a great option for people who have multiple Macs that they wish to upgrade to the macOS Big Sur beta. You can easily use your bootable USB installer as a startup disk from which you can boot your computer in order to install the Big Sur beta software.
You don’t need a bootable installer if you want to upgrade the current macOS on your startup disk to the Big Sur beta on a single machine. Nevertheless, it’s helpful to have a bootable installer handy for troubleshooting purposes and when installing the macOS Big Sure beta on multiple Mac computers without having to download the installer each time.
Prerequisites
Before proceeding with the creation of your bootable installer for the macOS Big Sure beta, here’s a quick checklist of the things you’ll need:
- A compatible Mac computer with macOS Catalina
- A USB thumb drive or external disk with at least twelve gigabytes of available storage
- Your disk must be named “Untitled” and formatted with the “Mac OS Extended” option
- The macOS Beta installer inside your Applications folder
The Terminal command that we’re going to use assumes that the macOS Beta installer resides in the Applications folder and “Untitled” is the name of the USB drive or other external disk you’ll be using as your bootable installer.
Do keep those two things in mind before you decide to move the macOS Beta installer out of the Applications folder and rename your external drive or format it with the APFS option.
macOS Big Sur system requirements
As we noted in our dedicated article which lists the official system requirements for macOS 11.0 Big Sur, the operating system is supported on these Mac models:
- MacBook (early 2015 and later)
- MacBook Air (mid 2013 and later)
- MacBook Pro (mid 2013 and later)
- Mac mini (2014 and later)
- iMac (2014 and later)
- iMac Pro all models (2017 and later)
- Mac Pro (2013 and later)
If your Mac is not on this list, you won’t be able to run macOS Big Sur.
As you can see for yourself, the Terminal command we’re going to use basically assumes that the macOS Beta installer resides in the Applications folder and “Untitled” is the name of the USB drive or other external disk you’re using.
How to create a bootable installer for the macOS Big Sur beta
To create a bootable installer for the macOS Big Sur beta, you’ll need to do the following:
The full tutorial continues below.
How to download the macOS Big Sur beta
Follow the steps below to download the macOS beta installer.
1) Using the Safari browser on your Mac, visit Apple’s portal for developers at developer.apple.com, then click the link Discover in the navigation section top of page.
2) Click the macOS icon right below the navigation section.
3) Now click the blue Download button near the window’s super-right corner and sign in with your Apple ID user name and password when asked. You can also visit the Downloads section directly, by pointing your browser at developer.apple.com/download.
4) Click the heading Operating Systems near the top of the page.
5) Click the blue Install Profile button next to the macOS Big Sur beta heading.
This will download Apple’s special app that will permit you to download the latest macOS beta using the standard Software Update mechanism in System Preferences.
6) If Safari hasn’t automatically opened your download, click the View menu and choose the option Show Downloads, then double-click the entry “macOSDeveloperBetaAccessUtility.dmg” to mount the disk image which has been downloaded into your browser’s Downloads folder.
7) From the mounted disk image, open the file “macOSDeveloperBetaAccessUtility.pkg”.
8) Doing so will launch the installer for the utility. Click the Continue button in the Install macOS Developer Beta Access Utility window to continue.
9) Click Continue, then Agree to accept Apple’s software license agreement.
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10) Click the Install button and type in your administrative password for this Mac, if asked, then click the Install Software button to continue.
11) Once you see a message saying installation was successful, click the Close button to continue. Optionally click Move to Trash when asked whether you’d like to keep the macOS Developer Beta Access Utility installer or move it to the trash.
Before the installer quits, it will open the Software Update preferences pane. If not, open it manually by clicking the Apple menu and choose the option System Preferences then choose the Software Update icon from the System Preferences window.
A message below the cog wheel should say that this Mac is now enrolled in the Apple Developer Seed Program, which lets it receive beta software from Apple. After a few seconds, the Software Update window will refresh itself to display the latest arrival, macOS Beta.
12) Click the Upgrade Now to grab the installer and make sure to fix yourself a quick sandwich until the nearly ten-gigabyte file completes downloading to your computer.
13) You Mac should automatically open the installer and display the Install macOS Beta splash screen. Do not click Continue because we’re not going to install the beta at this point. Instead, quit it without continuing installation by choosing the Quit Install macOS option from the Install macOS Beta menu or press the combination Command (⌘) + Q on your keyboard.
To verify that the macOS Beta installer has successfully downloaded to your computer, click the desktop and choose the Applications option from the Finder’s Go menu. You should now see the app named “Install macOS Beta.app” in the Applications folder.
We’ll use the macOS Beta app to create a bootable installer on an external volume
Do not rename or move this file out of the Applications folder because our Terminal script depends on this default location and file name.
Removing the beta profile
With the installer downloaded to the computer, we’re going to switch back to the standard Software Update feature so that your Mac only receives stable software.
1) Open Software Update in System Preferences.
2) Click Details below the cog wheel
3) Now click the Restore Defaults button and provide your administrative password in order to confirm that you not longer want this computer to receive beta updates from Apple. Don’t worry, this won’t delete the macOS Beta installer that we’ve downloaded. After a few seconds, the Software Update feature will revert to its default settings.
The message below the cog wheel that confirms your computer’s enrollment in the Apple Developer Seed Program should disappear automatically after a few a moment or two.
This will restore your Mac to its regular update cycle. Software Update will be showing you updates for your current macOS version. If you’d like to install any new beta updates, you can do that by booting into your beta volume and use Big Sur’s own Software Update.
How to erase an external drive
Before you can create a bootable installer, you must prepare your USB thumb drive or other external disk by erasing it. Note that you must have at least 16 gigabytes of storage space available on the disk to create a bootable installer.
Follow the steps below to erase your external drive with Disk Utility:
1) Launch Disk Utility via Spotlight or the Applications/Utilities folder.
2) Plug your USB or other external drive and wait a few seconds, then select the mounted disk in the Disk Utility sidebar underneath the heading External.
3) Choose the option Erase from the Disk Utility toolbar near the window top.
Erasing the disk permanently deletes all of its files
4) Type “Untitled” in the Name field and select Mac OS Extended (Journaled) next to the Format popup menu, then click the Erase button. Do net set the disk format to APFS because you won’t be able to create a bootable installer with it.
Do not change these options
This will wipe the disk clean, permanently erasing all data stored on it. Click Done when prompted to finish erasing the disk, which should now appear on the desktop.
How to create a bootable installer for the macOS Big Sur beta
You can create a bootable installer for the macOS Big Sur beta with a little help from the handy “createinstallmedia” command in Terminal. Without further ado, follow the step-by-step tutorial right ahead that will guide you through creating a macOS Big Sur bootable installer in Terminal:
1) Plug in your USB thumb drive or other external drive into your Mac.
2) Launch Disk Utility via Spotlight, select your disk in the sidebar and use the Erase option with the parameters detailed in the section “How to erase your external drive”.
Be sure to set the formatting scheme to either APFS or Mac OS Extended (Journaled). The disk name must be “Untitled” or the Terminal command won’t work.
3) Launch Terminal via Spotlight or your Applications/Utilities folder.
4) Type or paste the following command in the Terminal window:
sudo /Applications/Install macOS Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled
5) Press Return after typing the command to execute it.
6) When asked, type your administrator password and press Return.
Terminal doesn’t show any characters as you type your password
7) When prompted, type Y to confirm that you want to erase the volume and press Return.
Creating a bootable installer takes some time so please wait until Terminal says it’s done.
Terminal shows the progress as the bootable installer is created
When finished, your USB thumb drive or other external disk will have the same name as the macOS installer you downloaded, such as “Install macOS Beta.”
At this point, you can quit Terminal and eject the volume
For those wondering about the potential that the Terminal method might wreak havoc on their Mac, you don’t need to worry as this is an official Apple-sanctioned solution.
How to use the macOS Big Sur beta bootable installer
After creating the bootable installer, you must restart your Mac and invoke the Startup Manager at boot time which will let you choose the macOS Big Sur installer on your USB thumb drive or other external drive as your boot disk.
Follow the steps ahead to use your macOS Big Sur bootable installer:
1) Plug the bootable installer into your Mac.
2) Open System Preferences → Startup Disk and select the bootable installer as your new startup disk, then click the Restart button start up from it.
As an alternative method to the Startup Disk preference pane, you can simply restart your Mac and make sure to keep holding the Option key until you see the startup disk selector, then use the arrow keys to highlight your bootable installer and press Enter to boot from it.
Hold down the Option key when turning on your Mac for the startup disk selector
3) Your Mac may restart a few times before it starts up to macOS Recovery mode. Choose your language, if prompted, then provide a password for your account to continue.
4) You will now see the Utilities window with several options. If you’d like to upgrade your current macOS version to the macOS Big Sur beta or install the beta to a separate partition, choose the Install macOS option and click Continue, then follow the onscreen instructions.
Avoid disrupting your current setup
You’ll want to select Disk Utility from the menu before launching the installer to prepare the startup disk by creating a separate partition to install the beta to it. You will be able to boot between your current macOS version and the macOS Big Sur beta by holding down the Option key while using the computer or changing your Startup Disk preferences.
You will want to install the macOS Big Sur beta without disrupting your current setup — according to Apple’s official release notes, installing the macOS Big Sur beta into the same APFS container as previous versions of macOS, like macOS Catalina, will prevent the Software Update mechanism from installing on the previous version of macOS.
That’s why you’re wholeheartedly recommended to use Disk Utility and create a new partition on your startup disk and choose it as your target during the macOS Big Sur beta instal process.
This caveat is buried deeply enough in the macOS Big Sur release notes that a lot of people are going to be bit by it. Creating a new volume in an existing APFS container had become the de facto best way to install a second OS. pic.twitter.com/BscbELxj6Q
— Daniel Jalkut (@danielpunkass) June 23, 2020
Oh, one more thing: the bootable installer may require the Internet to get information specific to your Mac model, such as firmware updates. If you’re prompted to connect to a Wi-Fi network, click the Wi-Fi icon in the menu bar to join a desired wireless network.
Change your Secure Boot settings
After selecting your bootable installer — either at boot time or via the Startup Disk preference pane — you may be see a message warning you that your default security settings do not permit your Mac to use an external startup disk.
You may need to change your settings to allow booting from external disks
That’s especially true for newer Macs equipped with Apple’s security chip that provides the Secure Boot capabilities. In that case, start up in macOS Recovery mode by restarting and holding down Command (⌘) + R until the Apple logo appears on the screen.
After a minute or two, macOS Recovery should load. Choose Startup Security Utility from the Utilities menu and enter your administrator password when asked.
macOS Recovery mode requires your account password before you’re permitted to use its tools
Now select the option Allow Booting From External Media which does just that. Next, close out the Startup Security Utility window and choose Restart from the Apple menu.
Change your default settings to allow booting from external media
You should now be able to use the Startup Manager (hold down the Option key while restarting) or the Startup Disk preferences to set the bootable installer as your startup disk.
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In this article, you'll learn how to install .NET Core on macOS. .NET Core is made up of the runtime and the SDK. The runtime is used to run a .NET Core app and may or may not be included with the app. The SDK is used to create .NET Core apps and libraries. The .NET Core runtime is always installed with the SDK.
The latest version of .NET Core is 3.1.
Supported releases
The following table is a list of currently supported .NET Core releases and the versions of macOS they're supported on. These versions remain supported either the version of .NET Core reaches end-of-support.
- A ✔️ indicates that the version of .NET Core is still supported.
- A ❌ indicates that the version of .NET Core isn't supported.
Operating System | .NET Core 2.1 | .NET Core 3.1 | .NET 5 Preview |
---|---|---|---|
macOS 10.15 'Catalina' | ✔️ 2.1 (Release notes) | ✔️ 3.1 (Release notes) | ✔️ 5.0 Preview (Release notes) |
macOS 10.14 'Mojave' | ✔️ 2.1 (Release notes) | ✔️ 3.1 (Release notes) | ✔️ 5.0 Preview (Release notes) |
macOS 10.13 'High Sierra' | ✔️ 2.1 (Release notes) | ✔️ 3.1 (Release notes) | ✔️ 5.0 Preview (Release notes) |
macOS 10.12 'Sierra' | ✔️ 2.1 (Release notes) | ❌ 3.1 (Release notes) | ❌ 5.0 Preview (Release notes) |
Unsupported releases
The following versions of .NET Core are ❌ no longer supported. The downloads for these still remain published:
- 3.0 (Release notes)
- 2.2 (Release notes)
- 2.0 (Release notes)
Runtime information
The runtime is used to run apps created with .NET Core. When an app author publishes an app, they can include the runtime with their app. If they don't include the runtime, it's up to the user to install the runtime.
There are three different runtimes you can install on macOS:
ASP.NET Core runtime
Runs ASP.NET Core apps. Includes the .NET Core runtime.
Runs ASP.NET Core apps. Includes the .NET Core runtime.
.NET Core runtime
This runtime is the simplest runtime and doesn't include any other runtime. It's highly recommended that you install ASP.NET Core runtime for the best compatibility with .NET Core apps.
This runtime is the simplest runtime and doesn't include any other runtime. It's highly recommended that you install ASP.NET Core runtime for the best compatibility with .NET Core apps.
SDK information
The SDK is used to build and publish .NET Core apps and libraries. Installing the SDK includes both runtimes: ASP.NET Core and .NET Core.
Dependencies
.NET Core is supported on the following macOS releases:
.NET Core Version | macOS | Architectures | |
---|---|---|---|
3.1 | High Sierra (10.13+) | x64 | More information |
3.0 | High Sierra (10.13+) | x64 | More information |
2.2 | Sierra (10.12+) | x64 | More information |
2.1 | Sierra (10.12+) | x64 | More information |
Beginning with macOS Catalina (version 10.15), all software built after June 1, 2019 that is distributed with Developer ID, must be notarized. This requirement applies to the .NET Core runtime, .NET Core SDK, and software created with .NET Core.
The installers for .NET Core (both runtime and SDK) versions 3.1, 3.0, and 2.1, have been notarized since February 18, 2020. Prior released versions aren't notarized. If you run a non-notarized app, you'll see an error similar to the following image:
For more information about how enforced-notarization affects .NET Core (and your .NET Core apps), see Working with macOS Catalina Notarization.
libgdiplus
.NET Core applications that use the System.Drawing.Common assembly require libgdiplus to be installed.
An easy way to obtain libgdiplus is by using the Homebrew ('brew') package manager for macOS. After installing brew, install libgdiplus by executing the following commands at a Terminal (command) prompt:
Install with an installer
macOS has standalone installers that can be used to install the .NET Core 3.1 SDK:
Download and manually install
As an alternative to the macOS installers for .NET Core, you can download and manually install the SDK and runtime. Manual install is usually performed as part of continuous integration testing. For a developer or user, it's generally better to use an installer.
If you install .NET Core SDK, you don't need to install the corresponding runtime. First, download a binary release for either the SDK or the runtime from one of the following sites:
- ✔️ .NET 5.0 preview downloads
- ✔️ .NET Core 3.1 downloads
- ✔️ .NET Core 2.1 downloads
Next, extract the downloaded file and use the
export
command to set variables used by .NET Core and then ensure .NET Core is in PATH.To extract the runtime and make the .NET Core CLI commands available at the terminal, first download a .NET Core binary release. Then, open a terminal and run the following commands from the directory where the file was saved. The archive file name may be different depending on what you downloaded.
Use the following command to extract the runtime:
Use the following command to extract the SDK:
Tip
The preceding
export
commands only make the .NET Core CLI commands available for the terminal session in which it was run.You can edit your shell profile to permanently add the commands. There are a number of different shells available for Linux and each has a different profile. For example:
- Bash Shell: ~/.bash_profile, ~/.bashrc
- Korn Shell: ~/.kshrc or .profile
- Z Shell: ~/.zshrc or .zprofile
Edit the appropriate source file for your shell and add
:$HOME/dotnet
to the end of the existing PATH
statement. If no PATH
statement is included, add a new line with export PATH=$PATH:$HOME/dotnet
.Also, add
export DOTNET_ROOT=$HOME/dotnet
to the end of the file.Installer For Macos Installer 10
This approach lets you install different versions into separate locations and choose explicitly which one to use by which application.
Install with Visual Studio for Mac
Visual Studio for Mac installs the .NET Core SDK when the .NET Core workload is selected. To get started with .NET Core development on macOS, see Install Visual Studio 2019 for Mac. For the latest release, .NET Core 3.1, you must use the Visual Studio for Mac 8.4 Preview.
Install alongside Visual Studio Code
Visual Studio Code is a powerful and lightweight source code editor that runs on your desktop. Visual Studio Code is available for Windows, macOS, and Linux.
While Visual Studio Code doesn't come with an automated .NET Core installer like Visual Studio does, adding .NET Core support is simple.
- Download and install Visual Studio Code.
- Download and install the .NET Core SDK.
- Install the C# extension from the Visual Studio Code marketplace.
Install with bash automation
The dotnet-install scripts are used for automation and non-admin installs of the runtime. You can download the script from the dotnet-install script reference page.
The script defaults to installing the latest long term support (LTS) version, which is .NET Core 3.1. You can choose a specific release by specifying the
current
switch. Include the runtime
switch to install a runtime. Otherwise, the script installs the SDK.Installer For Macos Installer Download
Note
How To Quit Macos Installer
The command above installs the ASP.NET Core runtime for maximum compatability. The ASP.NET Core runtime also includes the standard .NET Core runtime.
Docker
Containers provide a lightweight way to isolate your application from the rest of the host system. Containers on the same machine share just the kernel and use resources given to your application.
.NET Core can run in a Docker container. Official .NET Core Docker images are published to the Microsoft Container Registry (MCR) and are discoverable at the Microsoft .NET Core Docker Hub repository. Each repository contains images for different combinations of the .NET (SDK or Runtime) and OS that you can use.
Microsoft provides images that are tailored for specific scenarios. For example, the ASP.NET Core repository provides images that are built for running ASP.NET Core apps in production.
For more information about using .NET Core in a Docker container, see Introduction to .NET and Docker and Samples.
Mac App Store
Next steps
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- How to check if .NET Core is already installed.
- Working with macOS Catalina notarization.
- Tutorial: Get started on macOS.
- Tutorial: Create a new app with Visual Studio Code.
- Tutorial: Containerize a .NET Core app.