Thanks for the solution at this this allows a person to open parallels when you're running under Catalina. Shape on Parallels Development they have done lots of nothing since the first Catalina beta was released we are now down to several rounds. I really had hopes they were a bit better than VmWare but they seem to be just as bad and slow.I copied the Parallels .app from my Catalina backup and did as this post suggested and it worked! Thank you!