You can (and should) download, install and start FileBot before and without purchasing a license:https://www.filebot.net/download.html
What does the error message say? Perhaps a screenshots would allow us to see what you see? (NOTE: if your license was banned then you would see a clear and unambiguous error message) Please read How do I recover a lost license key? if you have lost your license key. Please read How do I restore my Microsoft Store or Mac App Store purchase? if you have used the Microsoft Store to purchase FileBot.
Please read the