I'm going to just do a basic run down here of how to download someone else's preset:
1. Download the file from MediaFire, FileSwap, whatever it may be.
1.a. If it is more than just one file and is in the form of a .rar or .zip file, unzip/open that.
2. Most of the files (though in some rare cases you have to run a mini-installer) you would download is a single .fhp file.
3. If it is indeed the case, it should say *person's username*_*preset number*.fhp So if you were to download one of my presets, it would say something like Crin_1.fhp
4. Save the file in FeralHeart > Presets. Not "My Presets", not "Preset 5", just regular old "presets".
5. You should not have to rename the file nor change it in any way. To see the person's preset that you just downloaded, all you should have to do is restart the game.
Now if you're talking about someone making a preset for you and then you downloading it for your own personal use, which I should have asked before typing that out, then that is a much different process that I'm more than happy to help with that. The above steps are only going to do something if if you are downloading someone else's preset xD