Currently running into the same issue, I’m using OS X 10.9.5 (old I know) and Epics website recommends 10.9 at a minimum. I checked all the relevant graphics specs for just running the launcher too. I cannot open the launcher once downloaded and installed. Immediate crash with the same UE4 Error message. Anyone got any fixes? I’ve been passed around Epic’s customer support team and gotten nowhere close to a fix.