Okay, two quick things to check. Can you redownload installer from https://www.unrealengine.com/ and install that? There was an update for Launcher, but you won’t get it if you can’t open Launcher to begin with.
Then can you check and make sure drivers for your graphics card are up to date?
I’m sorry to say it, but your graphics card is definitely causing problem here. It’s an old card that is below spec. Even if you could get Launcher to open, you probably wouldn’t be able to use editor anyway. We are looking into fixing issue so that lower end machines can open Launcher, but it won’t help you run editor with that card.
Hi, today I faced very same problem. I have UDK and several other 3D program installed inside an old machine and all runs smoothly, but Unreal 4 does not start at all. It fails silently. Log is about same reported here. Thanks for this post, I’ll try update my video card as well.
— Old Machine
AMD Athlon 64 Dual Core
4 GB
NVidia 6800GT
Windows 8 Pro
DirectX 11