You tried deleting the Wad? Or the map. The way Im understanding this is that you don't have the wad. Steam is retarded.. it doesnt downlaod the needed wads, although it should. You need to install 1.1 to a new folder so it doesnt overwrite ur 1.2, take out the wad, then put it in ur esf folder. It will work...if you dont want to do that ... make a thread asking for a link or look around esf-world.com or redsaiyan.org