For those that are avid gamers, you probably know sometimes game updates can be close to 100GB or more. Sometimes you find out there’s an update when you launch the game and therefore have to wait to download the very large file that can take a while depending on your ISP package. I’m asking the community if such an app exists that will download this update automatically so it can be downloaded for my local server instead. My local network is many times faster. I believe this would essentially be caching the update locally on my server. 

Do a search for lancache on the apps section. I've not used any of them, but its the idea your talking about.