I did test the file associations feature and it seems to work OK.
When I ran the Associate File Types from the Utilities pull-down in the 32bit version, closed the program and double clicked on an SGU file, it opens in the 32bit version OK. I then opened up the 64bit version, did the Associate File Types from the Utilities pull-down, closed the program and then double click on the same SGU file, it starts the 64bit version but of course gives me the error message. I then re-opened up the 32bit version, re-associated the file types, closed the program and double clicked on the same SGU file and it again opens up in the 32bit version and runs just fine.
That part seems to work OK but it does not do me any good if I can go any further in the 64bit version.
You would think that if I can do these checks, PG Music testers should have also been able to do a lot of beta testing just to see if the darn thing would even get off the ground. Looks like they missed something as important as this again.
Oh well, I know they will get it fixed eventually. I can wait. After all I still have the old trusty 32bit version running on my state of the art system for 2019!