How to Install Big Sur on Mac?

How To Get Old MacOS

Click this link to open the Mac App Store on the Big Sur page.
Click on Get.
Software Update will open with the words "Finding Update".
Once the installer has downloaded do not click Install.

How to Upgrade to MacOS Monterey

Oct 25, 2021

How to Clean Install MacOS 11 Big Sur

Click on the Apple icon in your menu bar > About This Mac.
In the Overview section, click on Software Update.
Click on Update Now to download the installer.
Follow the installation instructions on your screen.

Why is my Mac not Installing Big Sur?

Log out of the App Store and log back in. Logging back into the App Store can sometimes fix issues with Big Sur not downloading correctly. Use Recovery Mode. Restart your Mac and hold down Control + R before clicking Disk Mode to restart your Mac in Recovery Mode, then try installing the updates from here.

How do I Install Big Sur on my Mac Without Space?

Backup your Mac. Back up all files and data that are stored on your Mac.
Free up disk space using CleanMyMac X.
Get rid of large and old files.
Use Apples builtin storage management tool.
Delete local Time Machine snapshots.

Why can I not Install MacOS Big Sur?

If youre trying to install Big Sur and it wont work, try updating your current operating system with the latest incremental patches. Restart your Mac and hold down Control + R before clicking Disk Mode to restart your Mac in Recovery Mode, then try installing the updates from here.

Can I Download MacOS Big Sur and Install Later?

macOS Big Sur cant be installed on Macintosh HD
Before you attempt to install any major update to macOS, you should back up your Mac. If you use Time Machine, you can run a manual backup using that. If not, run a backup using whichever backup tool you usually use.