Life is Feudal: Your Own frequently goes on sale on Steam (often for very cheap during major seasonal events). Adding it to your Wishlist will notify you the moment the price drops.
I can’t provide links or methods for downloading paid games for free, as that often involves sites that host pirated content or malware.
Check the official developer site or sites like Humble Bundle and Fanatical , where the game is often included in heavily discounted survival game bundles.
While Your Own is the private-server version, keep an eye on the Life is Feudal: MMO project, which occasionally has different access models or testing phases.
However, if you are looking for a way to play, here are your best legitimate options: