if you have an upgrade install number but cannot locate a previous version do the following:
use an install code from a full version
after the computer reboots DO NOT run quickbooks
open up regedit and go to the following key
HKEY_LOCAL_MACHINE\Software\intuit\QuickbooksRegistration\12.0
change the install key to the correct install key
exit regedit
run quickbooks
goto file register
enter in the correct registration code