I'm sorry if it's a beginner question. We have an app developed in Avalonia/C# running on Windows and we want to release also version for Mac OS. We are using LimeLM for activation. Question:
In Windows there's a TurboActivate.exe file to run the application activation. Is there something similar for Mac OS? Or we have to do it manually?
No, the TurboActivate Wizard is a simple Windows-only (and completely optional). Windows a different beast than Unix (macOS included) which is why there aren't equivalents on those platforms.
But all you need to do is create a simple dialog in your app with a textbox for product key entry and use ta.CheckAndSavePKey() and ta.Activate() functions.