Hello again!
In that case, I would suggest a full uninstall/reinstall of all Epic software:
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First, uninstall the engine, launcher, asset packs, etc
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Next, open the registry directory HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Builds, and delete any build entries
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Finally, delete the folders %userprofile%\AppData\Local\UnrealEngine and %userprofile%\AppData\Local\UnrealHeaderTool
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After that, reinstall UE from scratch, all settings should be at default values