Why dont it work with forth gen iPods

Ok so i dounload it right and i go into all exited because my friend that has a THRD GEN got it and its smooth so i have an iTunes card and i buy this after the freekishly long dounload i start to play and it says "your divide does not meat the requirements" so it lets me see all the videos and fiddle with the Mechlab and it wouldnt let me play (i have a fourth gen) and so i spent 5$ on nothing?!

Masluca007 about MechWarrior: Tactical Command, v1.4.0