keystring My XP machines are strictly off line, and I've gutted most of the Microsoft bloat to make them run better. Although, the XP bloat isn't nearly as bad as newer systems, especially the 64bit stuff. Anyway, when I got the original Finale 2009 and Sibelius 6, I created an ISO file for each and saved them to both CD's and a backup drive. So, even when I've changed a hard drive, or built an entirely different PC, I can re-install them. I got in the habit of making ISO's of almost everything, games, apps, etc., back in my I.T. days. Kind of geeky, I know.
I have "hard versions" of Office from 97 to 2000, and have reinstalled them from time to time on those XP dinosaurs. But I hardly use Word, or any of the MS Office programs. I also tried Open Office, which is an open source suite similar to MS Office, and works on almost any computer, free as well.
For "Office-type" chores, I find everything that comes with a Mac totally sufficient, maybe even better. And for serious writing, I use Scrivener, and like it much better than Word.
Newer versions of Windows won't run old 23bit programs, mainly for Internet security reasons. That's why I have old XP machines, to play some old games, run music software, but would never go online with them.
I know this doesn't help with your Finale problem. If I remember, when I looked into Dorico, they wanted a lot of personal info and, what I felt were, unreasonable permissions, just to install the demo. So, I never even tried it.