I believe you want the specific editing tool I mentioned above, not the B2S server. IIRC, the server is for running the B2S files alongside the tables, i.e. playing the table on one monitor, with the backglass on another, like 'cabinet' folks do. That's not going to help you in this case.
Get the latest version of the specific editor I mentioned above at VPF.
Open the B2S file you downloaded earlier, and IIRC, cycle through the images from a list, then right-click-save the ones you want.