Every day the same question.
We offer our software as a 30 day trial version. During the 30 days all functionalities can be used. Even after 30 days decryption is still possible.
To Windows. In the past I have used a few programs from Windows which are no longer offered by Microsoft. These I can only continue to use on virtual XP computers. And the great thing about Microsoft is that they do not use or support standard formats, so I can ONLY continue to use the files in the Microsoft program. This only to philosophy of Microsoft.
Of course I can’t say that our company and programs will still exist in 10 or 20 years, but you should save a backup of the corresponding setup as a backup anyway.