Hi @Juanca436 ,
Maybe that error happens because of an issue with the GPU or how UEFN handles shaders during startup. If it crashes at 90%, it’s probably due to a problem during the graphics initialization phase.
Try this and see if it works:
- Update your GPU drivers from the official website.
- Force UEFN to use DirectX 11
If that doesn’t work, try deleting the following folders inside Saved Folder (C:\Users\YourUser\AppData\Local\UnrealEditorFortnite\Saved)
- Config
- Crashes
- Logs
Hope it helps!