The editor data DLC is indeed required for the editor to work correctly. It also contains data for the interaction modes (moving and rotating objects).

There is a known issue with the DLC tab not showing up on your game properties, but there was a workaround posted here: http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=612889#Post612889

Last edited by Larian_JB; 19/09/17 06:53 PM.