I just purchased a Tivo Roamio Pro and went to subscribe to the podcast. However it was not as easy, at least for me, as it was on my previous Tivo. So I went to Tivo's website and logged into my account. There I found a MUCH easier way to subscribe. You can see it below:
Note the parts of the image I have tagged. At the top, chose your Tivo (assuming you have more than 1 in the house). Then select "Games and Hobbies" and then you should see jpeg2RAW listed. You should see "Get a Season Pass" under the jpeg2RAW name.
That's it. You are not subscribed to jpeg2RAW on your Tivo and you will automatically get the show when new ones come out.