I discovered tonight that you can directly launch the older versions of Unreal Editor using the exe file path. My current project is 4.20 but launching the default editor would always open the newer 5.1, I was then clicking Marketplace and launching the 4.20 from the engine launcher dropdown. I did some directory snooping and figured out the engine launchers are in their own version folders in the library and you can simply launch them using the appropriate exe. ie. “C:\Program Files\Epic Games\UE_4.20\Engine\Binaries\Win64\UE4Editor.exe”
If there is a more appropriate way to do this, I welcome your reply. I am quite new to Unreal Engine.
You can choose which engine you want in the launcher
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