Hi Robert / @Guitarpima,
You can work alone in this course, but yes, the stems for Sledgehammer and In Your Eyes are not available externally for manipulation in a DAW of your choice. We did, however, provide links to the Shock the Monkey stems that Peter has released on Soundcloud, and that provides a way of working in this course with your own DAW.
The mixing interface we designed will also work in Safari, and to a limited effect in Firefox; Google Chrome works best.
As it says around the live stream video from the live interview, it was a lo-fi version posted to get the content out to you in a timely manner. We will be posting a high res version soon with a full transcript.
The beauty of free online resources like PWYM is that you can choose to participate or not. If you find that this is not the community for you, feel free to move on.