I just checked the App Store for updates. As expected, there were updates for several apps in order to add Big Sur support:

• GarageBand
• iMovie
• Keynote
• Numbers
• Pages
• Xcode

Macos Catalina Patcher Firmware Update Required

MacOS Catalina 10.15.x has brought some changes in security and permissions when installing products like iZotope offers. As a result of this, not all products are compatible with macOS Catalina. All currently sold products on our website have been updated for macOS Catalina. Along with macOS 11.5 being released, security updates have arrived for both macOS Catalina and Mojave.Fixes included are for flaws that could lead to malicious applications gaining root access.

I clicked the “Update All” button to be informed “GarageBand can’t be installed on … because macOS version 11 or later is required.”

Seriously? Big Sur just shipped yesterday and Apple has already made a flagship app incompatible with everything else?

Firmware Update Required Catalina Version

And why is it being presented on my list of updates if it’s incompatible? In the past, the App Store would never show incompatible updates.

This is absolutely shameless self-promotion. If they think this is somehow going to convince people to upgrade their comptuers to a new and untested operating system, they’re completely nuts.

Firmware Update Required Catalina Island

Firmware Update Required Catalina Patcher

UPDATE: Further investigation (see comments below) indicates that this was a mistake, not an intent to drop support for GarageBand on macOS versions 10.*. But at this time (November 17, 2020), the mistake has not yet been corrected.