I'm using REXGEN 2.50.10 on windows 10. The target is a pi3b with an new and updated Buster. I installed the REX software using the instructions in the current documentation. After a clean new PI when I try to connect to user pi with the correct pswd I get :

Connecting to rex://pi@192.168.1.245:43981/ System user doesn't belong to any REXYGEN group on target device (code -123)

sudo getent group rex yields : rex995:pi

When I got this error I thought it was because I didn't have a license. Am I incorrect?

When I request a demo license the form just disappears and restarts REXGEN Studio. No error code just a restart.