Hi, C clearly. I rarely have the quickest or easiest tech solution, but what I like to do is use wikiloc.com. I go stage by stage and can choose hiking/biking, etc. Then I tend to use the most recent one, but I do check it out to make sure it comports with my understanding. There are lots and lots of options, and once I find a user I like, I tend to stick with him/her for the rest of the route.
I am by no means an expert, but one of the problems you may have with downloading the entire Vdlp and Sanabres on your GPS is that there is a limited number of "points" that the device will take. When I download from wikiloc, even one short stage of 25 km or so has more points than the device will incorporate, so that means I check the box that tells wikiloc to transform the tracks into one with 500 points, which my device will incorporate. That is perfectly accurate enough for a 25-35 km stage, but would not likely be good for the entire route of the Vdlp or Sanabrea.
I once learned this the hard way. When Susanna and I were walking the Camino Olvidado from Bilbao, it turned out that the tracks that were loaded up had way more than the accepted 500 points -- which meant that we had tracks only for the first part of every stage. So it required re-loading with the "fewer points" version. Hope this makes sense. And I'm sure that the more savvy tech people on the forum can help.