Invalid license since macOS 10.15

I have an old TotalFinder license (from before 2014?), but it has been working fine through all the OS X and macOS upgrades since. However, after re-installing macOS 10.15 beta in connection with an SSD upgrade, I was suddenly told my license number is invalid (TotalFinder 1.12.0). Any luck or do I have to re-purchase a license ?

The license should be valid. Please send me a private email to with your license name or key and I will try to help there.