You guessed correctly.

There is a conflict between Finale 2014d and Mac OS 10.13.2 - In Other Words:

Upgrade your Finale version, or downgrade your OS version.

> I´m using Finale 14d, my mf-tool makes Finale crash. I have upgraded to OS 10.13.2<

That is expected. Otherwise, what Peter says.

Theres a $99 upgrade available through Jan 15. It’s time. 

https://makemusic.zendesk.com/hc/en-us/community/posts/115007972353--99-Upgrade-offer-back-through-Jan-15-2018

So can I get Finale 25 with the discount? I live in Sweden. Or any sort of discount? I am an elderly composer with a small pension and have used Finale since 1995.

Log into your MakeMusic User Account to begin the Upgrade. The Promo code is PARTYLIKEITS99 and it is good through January 15, 2018.

The Chrome browser has had problems with this. Safari, FireFox and Internet Explorer are ok. Some people have had problems upgrading through firewalls and VPNs — these may need to be temporarily disabled.

If you have problems with the process, contact MakeMusic Sales and/or Support via the Submit a request link at the top of the page.