Hmm, that's very odd! Here, I'll toss the x64 version up on dropbox and post a link here in case anyone else runs into that problem.
https://www.dropbox.com/s/33i0v6mwme02myi/MGGv05x64.zip?dl=0
There you go :)
Viewing post in Download not working.
To be honest Unreal Engine 4 is very taxing, there's still a lot of bells and whistles I have to deactivate. I'll see if I can optimize the settings and patch it soon so it's more friendly for people with slower computers, because based on the models and textures being used it shouldn't be that bad.