TTP12 Beach Balls have to Force Quit

I’ve been using Tech Tool since version 6 and it’s always worked great. Recently upgraded to latest version 12 to use with Catalina. Installer was Slow… with many Beachballs. Installed helper, and Granted Full Disk Access. When I try to run any tests with TTP12 - it freezes with spinning beach ball, I have to Force Quit.
I have uninstalled/reinstalled - and the result is the same.
Mac OSX 10.15.2
2013 MacPro