Kurgen: "If patch installation fails for any reason (for example, due to a failed Internet connection), uninstall the game completely and proceed with reinstallation as outlined in item 2. "
Err... no. That would be around the time I'd be moving on to another game. Let's hope I don't hit that particular error. Maybe if it didn't affect saves, but even then...
You don't have to sit there and watch the installation bar gradually build up. You could just set it installing and go off and watch TV for a bit. You don't even have to leave the PC, just go on iPlayer or download and watch Game of Thrones.