@cernel If I understand correctly you're suggesting it be an either /or to download from repo's or to download directly from a URL.
The alternatives that would accomplish are not very palatable to me:
A) We add a second button to the main screen.
Cons:
\B) When clicking the 'download maps' button we ask whether to download from repo or direct URL. I don't like this very much as we introduce an extra button click when 99.9% of the time users will be downloading from repos.