Help with terrain mesh

I have installed the scenery for British Columbia as per the readme from avsim site. When in the FS9 scenery library, "add area", I go to the folder \scenery\srtm-na\scenery the scenery file na82etc.bgl does not show up for me to instal it. In looking at the stock scenery files that come with FS9, there is a .dat file in the scenery folder and a texture folder in the scenery folder. Neither of these two are in the \srtm-na folder. Any suggestions to instal this add-on scenery would be appreciated. 
