Hello there @Ahmed_Ali_League!
Considering your scenario, I would suggest a full uninstall/reinstall of all Epic software:
- First, uninstall the engine, launcher, asset packs, etc
- Next, open the registry directory HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Builds, and delete any build entries
- Finally, delete the folders %userprofile%\AppData\Local\UnrealEngine and %userprofile%\AppData\Local\UnrealHeaderTool
- After that, reinstall UE launcher from scratch, and add your desired version of the engine
If the issue remains active, please check the alternative solutions tested in the following thread: