It downloaded fine for me as well. Just a note, the launcher only accepts .zip folders, .rar's are not accepted.
Now... Atleast try to get everything from official sources:
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/1439594-dragon-mounts-r46-wip
http://jenkins.ic2.player.to/job/IC2_experimental/
Also, you need to set the modpack version on 1.7.10, not on 1.7.9. Just look farther on the list, its there, just not where you'd expect it to be.
