I'm not trying to push anything. I'm actually trying to give you good advice.
MAPS.ME do not have distances betwen cities, prices for accommodations, etc. The KML files you downloaded are not very updated and do not have the information you probably want.
Guidebooks have not been updated last year and this year because of the pandemic. And a lot of changes happened since then. The biggest guidebook available is even recommending using apps this year.
You have multible apps available with offline information. And most of them free, They all have more updated information than what you have with MAPS.ME and the KML files you downloaded.
Here is a list from the the top of my head that probably all have better information than what you downloaded: Camino Ninja App, Editorial Buen Camino, CaminoTool, Wisely ...and there is probaly 10 or 20 more. And most of them are free.
I can probably make a very long list of reasons why I think my app is the best, but it is really not relevant here and everyone have their own preferences. But there is one vital thing it has right now that other apps do not have. Information about what accommodations are open and not.
That information can also be forund here:
From Porto to the Spanish border:
https://albergueperegrinosporto.pt/theway
From Tui to Santiago:
https://ideas-peregrinas.com/camino/
The information on the lists are also in the Camino Ninja App. And a lot more information you probably also want.
The lists are updated daily. And so is the app. Almost everyone walking in Portugal uses the app, and for a very good reason. You will find out when you are there.
I just want to let you know so you are informed. I'm not trying to push anything. I just don't want you to be uninformed.
Best