Alright, just to play it safe to ensure people can find and or use the map, just follow these simple directions

-=Having problems locating the map=-
Prepare your game > Go to the map options > Additional maps > Scroll down into the i area and locate Irune. <-- We're all Human, sometimes we just overlook something. :)

-=Map is not appearing in 'Additional maps'=-
Alright sometimes the issue is not exactly under the control of people, so to resolve this follow the following solution

My Documents > My Games > Civilization 5 > Mods > Homeworld Irune > Homeworld Irune> Irune <-- Take this file and move it into the folder 'Maps' which is located in Civilization 5. Once this is done, follow the steps of the -=Having problems locating the map=- section.

This should solve the issue, if it doesn't solve the matter please let me know, and I will see if I can provide further support. :)