a friend of mine got the same problem.
launcher works fine but everytime he hits launch game or want to join a server the renegade x banner will show up and the game will crash. We tried every fix we could find on the forums some resulting in a not responding blackscreen and again crashes.
redownloading and installing did not help too.
We used the same mirror and everything is working fine for me.
both using win7 64-bit
drivers are all up to date
He is using a laptop but graphics card and cpu are able to run everything available atm.
I can ask for further system specs
we tried:
-reinstalling directx
-manual patching
-editing files: UDKSystemSettings.ini (resolution and bAllowD3D9MSAA) and some shader option in another file I dont remember right now
-deleting UDKRenenegadeX.ini
-redownloading and irenstalling