Yes, you can authorize Finale 26 on two computers.

If you've already used both authorizations, log into your MakeMusic account and click onto Manage Authorizations. This will let you de-authorize prior activations on, say, work stations you no longer own or use.

Finale isn't the only app that does this, of course. Recently, I tried to add a new iPhone to my Kindle account but got the too many devices error. Huh? Never saw that before. Logging into my Amazon account, I found every iPhone, Mac, iPad and iPod that I'd owned since 2010. After deleting the 14 I no longer owned, I was good. Then I logged into my iTunes and Apple Support accounts and did the same thing. Let's just say I did a lot of housekeeping that day.