My install of Ample AGSC v4.0 on Mac M5 shows "failed to check license status". I installed the 3.7.0 version before, so I think something is conflicted. How to solve this issue? Are there some guide to clean the previous license info? Thanks!

 

"failed to check license status", just in error message lingo sounds more like your firewall blocking it from connecting with the authentication server. I don't use any Ample Instruments but here's where I'd look for leftover demo remnants. I like to use WideBlue Sound's Audio Plugin Installer because it is safe and does a decent enough job removing stuff. But with Demo remnants or other incomplete removals, remnants can matter.

If you use Find Any File, if you search Mac HD for Ample, you will probably find everything, or at least the folders they live in.
Usual places to look:
/Library/Application Support/Ample Sound/ <-system library location
~/Library/Application Support/Ample Sound/ <- user library location.

Tahoe is interesting with this if you are using older installers. You can at least permanently unhide your user library,
issue this in Terminal: chflags nohidden ~/Library

If you have to go remove some property list files, they will be in your /Library/Preferences folder.