So, don't try to do it w/o installer (by copying dlls) 'cause it's not doable.
In case of VS 2003 Crystal Reports 9 (bundled Version):
License key should be entered in "Crystal_regwiz2003.msm" (aka "Seagate Registration Wizard" module)
Detailed instruction how to do this, you can find here:
Also, if you need to update merge modules: