Well, I tried to install the same package on my home desktop PC and I experienced no problems at all.
It strange. Probably is related to the system... I will let you know if I can replicate the issue.
Just out of curiosity: How is it possible for the installer to write the timer.w5s.patched file on the System directory? In my home PC with the succeed installation only the timer.w5s exist on the System directory.