Cubase 10.5 hangs while loading plugins

suddenly My cubase 10.5 is hanging while loading vsts or and the rotating circle never goes away.
it is happening on all plugins and vsts except kontakt for now.
please help! im on sieraa 10.12.6


I’m sorry, Cubase 10.5 is not macOS 10.12 compatible.

Could you try in the Cubase Safe Start Mode [Disable preferences], please?

make sure, your plug-ins are up to date (and compatible with macOS 10.12.), please.