If you're looking for a free or cracked version ("hot" often implies unauthorized or torrent-style download):
Once the raw data is downloaded, it must be converted to the PathLoss internal format (.pla or proprietary database format). pathloss 5 hot download
Fix: Your SRTM files are in the wrong format. Pathloss 5 requires .hgt files renamed to .dem. Use a batch renaming script: If you're looking for a free or cracked
ren *.hgt *.dem