You will need to download the map by uploading it to mediafire.
If you get confused:
1. Ask you friend if she/he can upload themap to mediafire. If not then upload the map.
2. After you/your friend uploaded tha map, press the link to download it and press download.
3. After you downloaded it, then put everything in the right files/folders (make sure it's somewhere inside feralheart folder)
I don't think you can create the map that you made on your friend's computer onto your computer.