I have installed the Elverana map and its not available to choose as the map.  Ive added the mod  and then loaded the game.  Left and come back and its still not listed.   Ive use Caballus with no issues so Im not sure what Im doing wrong.  A friend loaded it up for single player and is using it now so the mod itself is fine.  Any ideas

Maps are pretty straight forward. Hrm.
On the mods tab, install the mod by selecting it, and then make sure the option is toggled in the drop down box that the mod is a map.

You can only have one map on the mods tab a time, so make sure no others are there.