I can't comment on that ebay offering, but after downloading the iso file, right click and Burn Disk Image to the cd. After its done, you can look at the cd and see all the individual folders and files. Load the cd in the RBZ and follow the directions posted previously. Make sure the key is in Run or the engine is running. Do not turn off the key /engine until the update is complete.
Debadged, Rhino Liner, stubby ant, Gorilla BC lugz, caf