I did exactly everything according to the upgrade instructions:
- removed the demo
- installed the full version (to d:\programme\jamstix2)
- applied the latest update
- copied the dlls over to d:\programme\vstplugins\drums\jamstix
- copied the updated jamstix2.dll to the same folder
- ran jamstix and got a very bad error message
then i applied the update again and copied the beta dll again to my vstplugins folder
everything is ok now, the error went away
but well, i absolutely got shocked at first...