Adding on then what's been stated. Maybe you should try reuploading the presets in case the link no longer works or if there is some misplaced files. Make sure you're saving it under the desire accounts and that you're not placing them anywhere else. Some files might be corrupted someplace and you might have to search and find which one. If all else fails, try saving all your files and uninstalling FH using the uninstall .exe I believe and then putting the files back.
Hopefully something works.
Another thing to maybe possibly consider (Don't know if your friend has this or not) is that they could possibly be using the Preset Sync and sometimes, that can kinda mess things up and they can't see your preset. If that is the case, just upload the desired preset to the preset sync. Just click on the User Panel at the top right corner, log in again, and it should have a thing at the bottom where you can upload it. However, if that is not the case, just disregard this. Just throwing out a possibility. ^^
Adding on to what was all said above is to make sure when they download your preset they don't have a number at the end of the preset.
EXAMPLE:
Salem_1.fhp(1)