I mean, it should be easy. I use Windows 10 myself so I could be wrong.
You can either download FH from the actual site: https://feral-heart.com/index.php?option=com_content&view=article&id=23&Itemid=40
Or you can use Mediafire: https://feral-heart.com/index.php?option=com_content&view=article&id=23&Itemid=40
You can use either of these tutorials (Torrent Download Tutorial (https://feral-heart.com/smf/index.php?topic=56712.msg775076#msg775076), Web Download Tutorial (https://feral-heart.com/smf/index.php?topic=56747.msg775438#msg775438)) to guide you with installing the game.