Yo, so I'm having this problem and my modpacks won't go on forge. It just goes on the normal Minecraft version.
For example, (I use 1.7.10, 1.7.2 and 1.5.2), if there were a 1.5.2 modpack and I downloaded it, it would just go to Minecraft 1.5.2, not forge 1.5.2.