Adobe Air Don’t work in OS X Big Sur

Have a look at this.

https://community.adobe.com/t5/air/adobe-air-applications-won-t-work-on-big-sur-beta/m-p/11650953#M56641

Niles5CEF reply was the solution for me after intalling Adobe Air 32 on Big Sur (11.0.1)

You should always wait to update your Mac operating system until you verify that the non-Apple programs you use are going to work properly... not only Adobe programs, the 2nd link below is about Avid... aimed at video editing, but it is a warning for ALL non-Apple program users
https://community.adobe.com/t5/download-install/can-i-run-my-adobe-applications-in-macos-11-big-sur/td-p/11586901?page=1
https://ymcinema.com/2020/11/15/premiere-pro-and-avid-editors-do-not-upgrade-to-macos-big-sur-yet/
https://tidbits.com/2020/11/13/big-sur-is-here-but-we-suggest-you-say-no-sir-for-now/
And, Apple's update sometimes isn't even compatible with itself
https://www.macworld.co.uk/news/macos-big-sur-bricks-older-macbook-pro-models-3798046/

I do NOT know if these links will work with sur
https://macpaw.com/how-to/downgrade-from-catalina or
https://www.macworld.co.uk/how-to/mac-software/downgrade-macos-3581872/