Cubase 10.5.20 Maintenance Update

All was well until i tried to install 10.5.2…now I’m;

…unable to get a clean install of 10.5.20, using late-2012 i7 MBP & Catalina 10.15.5…
…program Initializing: be comes unresponsive while scanning vst3 plugins…
…am unable to load 10.0.6, 10.5.0 as well…same scenario…
…properly installs if i choose to load only Steinberg plugins…

I am back to 9.5!
any suggestions are welcomed…

BTW - UAD LUNA WORKS JUST FINE!!