We wrote a guest post for the “Of Note” blog – “Restore Finale Customizations After Upgrade”
Having upgraded from Finale 25 to 26 to take advantage of many improvements in application stability, speed, graphics performance, and articulation handling, we had to go through the moving process, dragging over all the plugins and configurations we depend on.
There’s a lot to remember, so we tried to lay it out in a thorough, organized fashion – check it out!

I’m curious as to what customizations and which plugins you’re using.
All that stuff is in the article – http://www.rpmseattle.com/of_note/restore-finale-customizations-after-upgrade/
Hope it’s useful!