For me, the file size should be irrelevant. Face it, if you want the units, you'll DL them regardless of size. I appreciate the plight of the unfortunate folks on 56k connections, but to make all of the things needed in the pack, it has to be huge.
An exe from a reputable site should not be a problem, but that's yet to be thought out.
With this pack, you'll be getting at least, if not more units ( ground and air ) as many as that came with the game, many of them higher quality than the in-game units.... because we could focus on the units and not the gameplay.
Everyday it gets bigger and bigger and understandably the release date gets farther and farther away

The light at the end of the tunnel is much much brighter though.