Yes, the ARIA player still works well as a plug-in and standalone app in Tahoe.
If you're using CC1 in your DAW and setting non-zero values in automation lanes, then those values should be passed to ARIA Player. I doubt there's a "bug" in GPO5 that makes CC1 zero. (It would ha...
Restore the file from your backup, or reinstall Finale.
Any functional development of the ARIA Player would have to come from Plogue, the company that made it for MM/Garritan. While they continue to develop their own products (e.g. Sforzando, which a...
The soundmaps are in the application support folders. On a Mac, it's: /Library/Application Support/MakeMusic/Finale 27/Data/ NB, this is the root level library, not the user library. (Near where Fi...
MakeMusic are still selling Garritan products, and the Finale announcement made no mention of them; so you should still be able to get support directly from MM. (Use the "Contact Us" link at the to...
Seriously, it's 22 year-old software. Even if you could register it, you'll be lucky if it runs on W11. Even the latest version, GPO5 is nearly 10 years old.
Just download the GPO5 installer from your account. GPO5 is just GPO4 plus additional instruments. If you're on a Mac, you may need to download the latest ARIA Player from this Help Center.
You may still get support for issues concerning registration and authorization, so it's worth submitting a support request to MakeMusic.
As my doctor says: What seems to be the problem?