UE4 4.18 - 4.19 missing

Hello, everything was normal but one day I start Epic Games Launcher and all my installed versions of ue4 are missing, so I was thinking, maybe I deleted them? So I decided to install them, but they are no where to be founded and It looks like everytime I install any version of the engine and when I close the Launcher and then open it again, all installed versions disappear. How can I fix it? deleting everything and installing didnt help me.