I've used email login and password, and also the OFFLINE method to register my FL 20.
It asks me to close the program after I "successfully register",
I then open FL again and it's in DEMO version. ...
FLStudio (20.6.1.1513) has encountered an error and need to restart.
Crash log saved to C:UsersmirkoDocumentsImage-LineFLStudioSupportLogsCrash folder.
Please use Ctrl+C to copy this message and report to support.
Exception ...