This problem seems very similar to mine, so I wanted to chime in. I just downloaded the Epic Games Launcher, and am trying to install Unreal Engine 4. Every time I attempt to download UE4 however, it reaches about 100KB or so then fails. Even worse, I can’t browse the internet for a while after this happens! I looked at the router’s status page, and it says my IP Address is 0.0.0.0 – meaning something has reset it.
I chalked it up to my ISP being odd at first, but this has consistently happened about four times, each right after I attempted to download UE4. Restarting the router and the modem didn’t help. I saw an old WoW thread where the WoW launcher was “crashing” the user’s internet access in a similar way and disabling UPnP helped them; but this didn’t solve my issue either.
And lastly, this is a fresh install of Windows 8.1 – literally installed the OS last night.
Windows 8.1 64-bit
Intel Core i7 950 @ 3.07 GHz
AMD Radeon HD 6800
Router is Cisco Linksys E1200.
EDIT: I’m looking into this as a general issue now instead of just an Epic Launcher issue. Apparently if the Epic Launcher is using a peer-to-peer method for downloading, it could trigger anti-DOS protections in my router. A common thread I’m finding is that if someone has a high transfer speed and a lot of peers they’re downloading from, their router will shut down for a moment. I don’t see anything in the launcher that indicates if this is the case, and unfortunately the launcher has no settings I can find (either in the program or in the launcher directory)…
EDIT 2: I managed to fix this problem! I fixed it by following an AnswerHub post directing me to an *.ini file; if anyone thinks digging in there might help them, the AnswerHub that helped me out is here.