- Find UnrealVersionSelector on your harddrive
- Try starting that. (If it says: “Register this directory as an Unreal Engine Installation?” hit yes. If this worked skip to 5.
- If it says "“The current folder does not contain an engine installation.” cancel and find your UE4Editor in Engine\Binaries\Win64
- Copy the UnrealVersionSelector and paste it into Engine\Binaries\Win64 so it’s in the same folder as UE4Editor. Now execute the UnrealVersionSelector.
- Go to your project and set it to open with UnrealVersionSelector
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