I just shipped a game on UE4, and from that day I read ~100 emails with complaining about crashing engine, just because the end user doesn;t want to read OS reqirement, and doesn’t installed Windows 7 Service Pack 1.
You should prevent installation of a game if Service Pack 1 is not detected, this is how UE4 solves this problem with itself when you try to install launcher. Also post Feature Requests in feedback forum, they are captured from there and place in Epic bug tracker