If you are getting an error after downloading the patch that says something about PatchEngine.exe not being found, go to C:\Program Files\Xplosiv\International Cricket Captain 2008 and open the PatchEngine.exe file.
If you are getting a checksum error, this is because one of the files it is trying to patch has been edited. If you get this error midway through the patching process and try to repatch the game, you may need to reinstall the game for it to work.