If your download manager or game patching process cause too much friction, you risk losing players.
Some new players may abandon your game simply if it's a pain for them to download. Associating your game with a bad download experience can be a costly mistake that you don't want to make
Your updates and game patching also present the potential to lose players because of friction. If the business model of your game relies on regular content updates, but your game patching process is painful, players may abandon your game based on a poor user experience.