Hey, just giving you an update. It is fixed. I am not really sure what exactly worked, but if anyone runs into this problem this is everything I did before it started working again. A: Delete cache as mentioned by SupportiveEntity, Uninstall Debugging Symbols, Verifying, Running epic and Unreal as admin, then completley uninstalling and reinstalling Unreal. (None of this worked but it may be neccessary to do all of these things for it to randomly start working again). After doing all of these things I just kept closing Epic from my task manager then opening as administrator and launching with the button in the top right (Dont do it from the library itsself as I tried this after it worked the first time and it gave me an error again). HOWEVER, after it gave me the error again, I once again closed with task manager, opened as admin and launched with top right button, and now it launches every time from library or the button in the top right of epic. Weird issue and I have no clue what about repeatedly closing epic and opening as admin and attempting to launch unreal with the top right button could possibly fix any problems, but it did.