Been having problem for the past few days.
I cant see my installed Unreal engines I have 4.19 preview 6 all the way back to 4.16 installed and now if I go to my launcher I dont see any of them.
I have done several reinstalls of the launcher and I just get options to install 4.17 .2
at one point the I deleted epic launcher and unreal related …installed the launcher installed 4.19 preview 6 and 4.18.3 but when I restarted the launcher I lost them again and could only install up to 4.17.2
here is what my screen looks like