From my experience, is better to include the graphical patch in your mod. Most players do NOT read instructions, they try and will get hysterical if map crashes on first day, then leave unpleasant comments which will screw further reception.
Beside, if you ask to download separately, there will be most likely dead links over time thus map become unplayable unless the player starts searching on his own the missing patch.
Include the patch in the map then release stand alone.
(This post was last modified: 19.08.2016 19:10 by Valery.)