The new expansion packs

I downloaded the two packs and when I try to install them (osx 10.5), the installation stops at "choose a destination" but it never finds any of my drives. Installing other software does not give this problem.. Masada's kits install with no problems either. Any suggestions?

The thing is that is only osx 10.7 and up compatible.
It is in the specs
Mac: 2 GB RAM (4 GB recommended) Mac OS X 10.7 - 10.8 with DVD–ROM drive - See more at: http://www.akaipro.com/product/mpcrenai ... quirements

My bad... I am running 10.7 not 10.5

Ah ok I don't know what it can be then.