Hmm....I'm not entirely sure what to suggest, but I can come up with a possible solution...
So, what I can suggest is you (if you haven't already got this program) download Utorrent. This is free and will allow you to torrent the installer. So torrent the FH Setup instead of downloading it. Then run that installer to install the torrented version. It also requires a 'patch' and you just need to download this normally and install it into the FeralHeart folder in your Local Disc (C:).
Ok, I'll put this in steps. If it doesn't work, you may have to wait for a better solution from another player of FH.
1.) Delete the setup thing you downloaded, Uninstall Feral Heart and delete all the feral heart folders after as they'll still be there in the local disc C.
2.) Go to
http://www.utorrent.com/ and click the "utorrent free" option to install it (if you haven't got this already. If you have, skip to stage 4)
3.) Run the installer for Utorrent and restart your computer (so it updates)
4.) Go to the Feral Heart Official Downloads page and click Torrent. Click 'Open with Utorrent' and it should torrent it and save it into your downloads folder
5.) Run the FH setup
6.) Go back to the official downloads and click 'download' on the Patch and run the installer for that
7.) When it asks you where you want to save the patch, save it onto the feral heart folder
This should work...if not, I'm not sure what to suggest, I haven't seen this problem before.