At top of mainpage https://www.psrtutorial.com/ there is a message:

"Note: the FORUM is no longer available due to a software incompatibility with the newly installed server OS!"

Hopefully this is a temporary issue.

For those of you that's not aware of it,
here is Yamaha Musicians Forum:
https://yamahamusicians.com/forum/viewforum.php?f=92

Yamaha Arranger related forums index:
https://yamahamusicians.com/forum/viewforum.php?f=97

And here you can go stright to the Genos / Genos2 related part of the forum:
https://yamahamusicians.com/forum/viewforum.php?f=160