I am definitely not a tech expert but when I was searching for help I didn't find it, so I'm posting this for anyone else who is stuck and can't get their game to work. See the screenshot: Patch Download Error, Failed to update resources, invalid file. The app was stuck 'connecting...' for ages until I finally got the error screen.

I tried clearing cache, reinstalling, even trying it on a different phone. It didn't work. My internet connection seemed okay, a bit slow but fine. In the end the epic Seven patch downloaded properly two days after the problem started. Maybe the problem was the hot, humid weather we had and my modem overheating and not working well. Maybe it was a problem with my connection, not the modem. The patch downloaded when the weather was cooler and after I had done a port reset on my modem.

So if you're having the same problem and clearing your cache and uninstalling/reinstalling doesn't work, look at your connection. Even if it is fine for everything else you do on the internet, it might not be stable enough for downloading the patch. Try doing a port reset for your modem: unplug the power and phone cables, leave it off for 2 minutes, then plug it back in or contact your ISP and ask them to send a refresh signal. It's worth a try.