Hi
Just tried this my self and got the same result as you did. "500 internal server error".
Will take a look at this right now! Thanks for reporting this issue!
We are going to replace the license generator with a new version since we also will remove the license server and only have license files from now on.
If you want to get started instantly I recommend you to try the v5 beta version since you will get a license included in that installation.
Install-Package XSockets -pre
Regards
Uffe