Make sure that your friend has read the README inside the map download if there is one. If there isn't - all the files in the downloaded folder need to go in Local Disk (C:)\FeralHeart\Exports and make sure you replace everything it asks you to. The most important file that needs to be in exports in the .fhm file. If this doesn't work then follow this:
Place all .fhs & .fhw (Sky & Weather files) into Local Disk (C:)\FeralHeart\Media\Sky
Place all .fhm (Map files) into Local Disk (C:)\FeralHeart\Exports
Place all .fho (Object files) into Local Disk (C:)\FeralHeart\Media\Objects
Again. Replace anything it asks you to.
I hope everything works out for you. Good luck!