I don't know why Canon can't produce a proper installable driver or at the very least a text file which explians how to get the update to work.
Try disconnecting the printer and then install the update. Restart the computer and then theh re-connect the printer.
If it is not recognised, go to the Canon support page and look for a way to contact Canon directly for support..
Mike Hall MVP - Windows Desktop Experience http://msmvps.com/blogs/mikehall/