So now you are using the latest released version I guess.
I meant the 8th preview of 4.7. There were 8 previews of 4.7 until we released 4.7 proper yesterday.
This crash still occurs in the full version of 4.7, however. I’m still investigating the cause.
I am not using any versions since they all crash on me 
You should be able to workaround the issue by adding
MinTextureResidentMipCount=7
in the [TextureStreaming] section in BaseEngine.ini
For some reason this seems to be missing. Maybe the installation failed (e.g. .ini file couldn’t be overwritten because of some permissing rights). It could be just the first issue of many. You might have to make a clean installation, maybe delete user settings and copy your existing content back into after you verify the build works.
We fixed the engine to not respond with the crash if the ini is missing - it might be a while until that reaches the public builds.