On Steam - right click the name of the game in your library and select properties from the drop down menu (see first screenshot below). Then select Game Versions & Betas and select Legacy (see second screenshot). It will then download the old UE4 version and overwrite the Enhanced version that you have. (Note: you won’t be able to use official servers with the UE4 version, but you can still use private servers that run the Legacy version or play in singleplayer/coop.) If you want to have both versions available, you will need to rename the main file folder for one of them (probably the one you expect to use less often) and then you will be able to have both installed at once. (You’ll need to launch the renamed one by directly starting Conan.exe (or the Battleeye version if you need Battleeye).
