NB_FF I had to re download and re-install Forge. In my case it was Avast stopping the download while it checked to make sure it was a safe file. So even thouigh it showed in my downloads , it didnt actually download.
This may sound incredibly dumb, but when I first started getting mods I had the same problem. As I was a noob back then, I didn't think of scrolling down on the list. when I tried it I realised had so many versions of Forge that the one I just installed had slipped onto another page of the list.
Isn't showing up for me either (I've scrolled thought the whole thing a few times) , not sure what's going on here. I checked the files and it seems like forge did install, It's just not showing up in the list for whatever reason.
SOLUTION FOUND: The problem was I wasn't installing forge to the orginal install of the .minecraft , some of you guys may have been doing the same thing.
I like to have multiple mod builds so I copy my .minecraft file a few
times and make different profiles for each one in the launcher. The problem was You need to install forge, then copy the file, not the other way around. For some reason if you install forge to a copied .minecraft it won't work correctly.
So yeah- Install Forge, THEN copy the .minecraft, it must be in that order if you want multiple .minecraft builds