Bit confused by what you said. The download for poser 11 pro and poser 11 is the same file. It is only when you put the serial number in that the pro features are unlocked. So did you do a full reinstall of the poser 11 download? A bit late now but all you had to do was change the serial number in poser. If poser 11 was working fine I would just do a full poser re-install and then put in your new serial number, and previous version number if needed.