
Note that this will kill the ability to play online but will make it so the map can be found in the Skirmish map list, even if it's not been exported as a sga file yet. That will tell the game to start in dev mode. To be able to play the map, right-click on the game in the Steam Library, click Properties, then click Set Launch Options, then enter "-dev" without the quotes, like in the screenshot below. \SteamLibrary\steamapps\common\Company of Heroes Relaunch\WW2\Data\Scenarios\MP.

To be able to save maps without the editor displaying an error popup, one must ALWAYS save the map in a folder at this location. The world builder exe (worldbuilder.exe) can be found in the gamefiles of the Relaunch version (.\SteamLibrary\steamapps\common\Company of Heroes Relaunch). World Builder - Map Editor Sorting out issues This in turn makes it even more difficult to sort out issues related to the map editor, which works in the gamefiles of both versions.

As it stands the difference is that the Relaunch version allows online play and has Steam Workshop support. I think the Relaunch version is not bad but it generated confusion because the old game was renamed "Legacy Edition" and the new game was renamed "Company of Heroes Relaunch", making the difference between the two very unclear. Relaunched on Steam somewhere in the 2010s.
