Downgrade unreal engine version

hi there. i have installed unreal engine 5 via epic launcher. for some reason i have to downgrade it to UE 4.27. but i can not set the specific engine version to install.
this is what i did:
in the epic launch, from left menu, select unreal engine, then from top menu select library, then i tap + beside engine versions, but it just added 5.1 and i can not set or change it to 4.27
any help? :slight_smile:

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thank you very much!
after I updated my epic launch, that little trigger showed up!