You have to change some lines in autorun.iss.
Search for all lines and change.
from:
'SOFTWARE\CD Projekt Red\The Witcher 2'
to:
'SOFTWARE\WB Games\Fear 2 Project Origin'
For improved your installer, you may want to change the font color in the Wizard installer and finish installer for better visualization or change the background image. The images below are my conversion for Fear 2 using The Witcher 2 Script:
Note: This conversion is not posted in the fileforuns, i used only for me. 