invalid Checksum

[mifs]

Hello, I have the donated version, with a fault "invalid checksum" as per the screen shot and I am unable to open the program and I do not want to download another as I have already donated twice in the past 12 months, with an other error which cropped up
The questions are
1/ How do I fix this
2/when I am attempting to fix the problem I will most likely need to reinstall FreeFileSync and will most likely lose my last 2 donations recognition
3/ how can I reinstall or update the program and still keep my settings and Donator status, without the feeling that the errors are a covert way of securing another donation, (as this is the second time this has happened albeit with a different error message) Please reassure me and do the right thing please, by fixing the problem and keeping me as a donation user
Kind regards
Mifs

[xCSxXenon]

without the feeling that the errors are a covert way of securing another donation

This is not what's happening.

You don't need to donate to reinstall. When you donate, you are given a unique URL/page where you can download the donation edition of the software. Go there, download a fresh copy, and reinstall