For the record, you can download Team Explorer free of charge for use with CodePlex. The download is a disc image file (.img), which you can use to burn a CD, or load it with a virtual CD player. If you prefer to use a .iso file, just rename the download.
This is not a “use anywhere” Team Foundation Server CAL. If you don’t have a Team Foundation Server CAL, you can only use Team Explorer to access CodePlex.