@eddie.jm Thanks for your reply. The stack overflow site has a lot of info it.  Do you specifically which download I want, and what is necessary to install it?

Update:  What seemed to have worked was manually providing the paths to the missing setup files in the dialog window where it gave you 3 choices as in the screenshot I posted.    I mounted and searched the downloaded Update 3 iso for each of the files .  Had to do this 3 times.  I mistakenly skipped one of the files after selecting it so hope that wont cause a problem later on but Pega Robot Studio launched.