Michael has not yet published his paper version of the Guide to the Camino de la Plata. It is in development now. When it is published, I am certain Ivar will feature it in the shop at Casa Ivar...
In the meanwhile, the smartphone app is available online. However, the app is two years old. At least my copy is, and I keep my apps updated and current at all times.
My understanding is that Michael is focusing on getting the needed information and updates to release the updated apps and roll out the first ever printed VdlP Guide.
Remember, the VdlP is a LONG Camino, over 1,000 km. This is longer than the Frances at 799 km. So there is a LOT of information to be obtained, sorted, arranged and maintained as current.
We must all be patient. I too am awaiting this material.
Hope this helps.