I have used the downloads at this link many times in the capacity of sound engineering teaching.
http://www.cambridge-mt.com/ms-mtk.htm In all the cases I have used them there were no stems just all the tracks. I am using the word 'Stem' here in the meaning that it is a sub group of a number of tracks. Good point from
Cactus below as well regarding that. I recently entered into a remix comp on the Indaba Music site and they used the word 'Stems' too but in fact they were just individual tracks not a sub group or anything like that. They were stereo tracks though and many of them were in fact mono sources just occupying stereo or interleaved tracks. You are better off converting those to mono before you mix usually.
What there is there is a short and also a full mp3 usually of the track which is great for determining if you are going to download it or not.
These sessions are usually very well tracked and the standard of the performing is also pretty good too.