You need to install the fonts so that they are available to all applications. This is easy on a Mac but I need some info. Are you using the Finale fonts or third party? Are you really running 25.5 or another build of Finale? What is your macOS? There used to be a link but it no longer works—that’s ok but it would have saved some time.
You won't get the Sonoma compatible 27.4 till it's available but we've been promised that soon — and you will be entitled to MM Tech Support when you do.
In the meantime, the way that MM installs fonts in 27 is different than it was in 25. I still know the old way to make the fonts available to all applications but am not confident that still works over Sonoma. If you upgrade to 27, you won't need it.