Well just try double checking that you placed all the files in and also . Follow the "read me" file if there was one BUT if it still doesn't work try the options below:
If placing the map files into the Feral Heart "Exports" folder didn't make it work right than try placing the files as so:
FHM files go into FH>Media>Terrains
FHO files go into FH>Media>Objects
FHS/FHW go into FH>Media>Sky
MP3 files go into FH>Media>Sounds/Music
Then restart the game (if it was open)
Goodluck and I hope that helps