Did you open that .rar file with either zip-7 or winrar? A .rar is basically a compressed folder with other files inside of it. Download either winrar or wip-7 and open the .rar using that program. Then export all of the files inside of it to exports. The .rar itself doesn't go there.
Official winrar and zip-7:
Winrar: http://www.rarlab.com/ (http://www.rarlab.com/)
Zip-7: http://www.7-zip.org/ (http://www.7-zip.org/)
I believe I can help you! ^.^
Anyways, I'll provid you some tips, then some links. ;)
1. Open the downloaded file. (Of the map)
2. Then look where the is written: .FHM .FHO
3. Then go to Main Disk >> FeralHeart > Exports.
4. Place the files: .FHO .FHM to the exports.
5. If there is any .FHW (FeralHeart Weather) or any practicles of the map.
6. Place the (FeralHeart Weather) .FHW to FeralHeart >> media > weather folder.
7. Now place the practicles in FeralHeart >> media > practicles folder.
Now here are some helpful links. ;)
https://www.youtube.com/watch?v=1ULvvPVJIk0 (https://www.youtube.com/watch?v=1ULvvPVJIk0)
Hope I helped! ^.^
Good luck downloading maps! ^.^