I have no idea whats wrong, my warband's steam installed and I place the mod in the right directory:
C:/Program Files (x86)/Steam/steamapps/common/mountblade warband/Modules
and I only have native to choose from.
Hmm okay I found the directory, its ...valve/steam/...
I dled a patch for Prophesy of Pendor and I'm still getting a RGL error.