Please read this thread and check your licenses before upgrading to v19.5:
https://community.claris.com/en/s/question/0D53w00005mStuiCAC/interim,-update-on-filemaker-19x-perpetual-licenses-purchased-now-getting-error-this-version-cannot-run-with-expired-maintenance
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There are 2 different issues. One is the numbering schema as Wim noted in the link from Torsten - the other one seems to be an issue with a 'part' in 19.5
Klemens from the 'FileMaker Magazin' mentioned that customers who are running into that issue should contact Claris
Link to that thread in German; Otmar mentioned a work-around
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