After getting nowhere with support I was directed to come here.
I am having the invalid keycode issue with Xcelsius 2008 SP4 on Windows 7 32-bit.
Alll of the suggestions from suopprt: entering the keycode directly into the registry entry and elevating the registry permissions to Full Control and running Xcelsius as Administrator, do not work.
What's interesting is that after a clean install there is already a keycode in the registry that allows for the 30 day trial. Re-entering this keycode via License Management causes Xcelsius to restart. It does not give an invalid keycode error.
Any information would be helpful.
Ron L