Update AC 20 Mac

[Brett Brown]

Can anybody please tell me why I am getting this error from a update downloaded from the Graphisoft Website. Even allowing it in System Preferences doesn't work

 

[Lee Hankins]

I don’t think AC20 is compatible with Big Sur. Apple introduced strict app signing. 

[Lee Hankins]

https://community.Graphisoft.com/t5/Setup-License-articles/macOS-11-Big-Sur/ta-p/304187

there may be a workaround. 

[Lee Hankins]

This is for AC21 on Catalina but may help fix your issue but it sounds like you may have already tried this. 

https://www.macworld.com/article/672947/how-to-open-a-mac-app-from-an-unidentified-developer.html

[Brett Brown]

Installed AC 20 from Disc without any problems and works well but I can't update it to 8005. Tried most of those suggestions but none worked. Seems to use the Java in the installer of 8005 instead of the installed one on the computer.

[Lee Hankins]

I can only assume that it is not supported in Big Sur. There may be a workaround if you can contact local support.