same way you need both ps7 and cs and once in cs you need to brush out every brush in it's own layer as black and then save it as a psd and open it up on 7 and then edit and define each brush separately and then you go to edit and preset manager and select the brushes you want converted to save as a pack. Make sure you know how many brushes are in the set or you can get somebody with cs to brush out the brushes on every layer and save it as a psd and send to you but you still need to define it and save it as a set

*cs2 to 7 and cs to 7 are the same way*