The reference is to the program's popularity within a specific category on Thus, that particular program would have had the 90th most downloads from users since Cnet began logging download counts several years ago. It's just a way to put the "total downloads" number into perspective.

As to accessing the forums, there is no direct link from most pages. There are, however, links to the forums in the left-hand navigation column on as well as the tabs across the top of Cnet Reviews. You can also bookmark for your convenience.

Hope this helps,