UEFN crashing before loading, Fortnite not loading

[Hardcawcanary]

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For anyone still experiencing this issue who have already updated Windows Defender, but have not had success with the above resolutions, please try the following: Close UEFN if it is open navigate to C:\Users\[USERNAME]\AppData\Local\Temp\.net delete the URC folder reopen UEFN (the URC folder will be recreated from scratch) and try again to open the project

I have used this method twice this update, once from crashing while saving and the other time I don’t know why, but the project would not open, all good now.