If it helps I just published an Offline Map app for the Camino Primitivo. It includes the trail and it’s variations as well as accommodation and distances and stuff.
Search your App Store for “Wisely : Camino Primitivo”.
The Invierno is second on my list, behind the San Salvador and ahead of the Ingles and Finisterre routes.
Unfortunately the Aragones and VDLP will have to wait some time. I do plan to do them, as I plan to do about a dozen more routes in an effort to bring greater awareness to them.... or at least to make future pilgrims a bit more comfortable with the idea of walking the less traveled and less documented routes.
2010: Porto - SdC - Finisterra 2011: E4 on Crete 2012: Le Puy - SJPdP 2013: Camino Madrid -> Del Salvador -> Primitivo 2014: European Peace Walk. 2015: Amsterdam - SdC & Barcelona -Burgos. 2016:Norte & hospitalero
There are a few free offline apps available in which you can load KML of GPX files. See this manual in the resource section
The Invierno, Aragones and VDLP are included in the 'all Spanish Camino' file which is also mentioned before.