You so not need the preset sync, but you could get it if you'd like. You will not see everyone's presets, only those who also have the sync. Another way of seeing others' presets is by downloading users' .fhp files and placing them into Feralheart\presets, not my_presets.
For example, if I wanted to see your preset and I downloaded your preset's .fhp file and placed it in that file directory, I would be able to see it in-game.
You can either ask for it or download it with any provided link. I suggest they add it to MediaFire or send it through Skype. Any file sharing site will allow you to receive the .fhp from them. As long as they have it uploaded to that file sharing site, or sent over Via E-mail or better yet, Skype. (If you know that person well of course, juat an an example.)