I was experimenting with skyboxes and accidentally deleted some assets related to it from the engine and now whenever I start up Unreal I get this error:

http://i.imgur.com/pczlUOd.png

e: Some detail about the image -

I accidentally moved some engine assets into a scene where I was experimenting with skyboxes, after I was done I deleted the project and now I'm assuming Unreal tries to find that deleted project so it can load back the Engine assets that are now gone.

How do I get these files back? Can I 'check files' or something similar to Steam and it'll only download the files I'm missing? I'd rather skip re-installing the entire thing.

edit

Solved it! There's apparently a big shiny "Verify" under the engine edition in the launcher that fixed everything in case this happens to you too.

No need to vote or respond on this anymore.