The game is officially available as the Stronghold Legends: Steam Edition , which features enhanced visuals and multiplayer support. You can find it on Steam or GOG.com.
For those looking to try before buying, official demos were historically released and may be found on archived gaming repositories like ModDB . Conclusion Stronghold-Legends-PC-Game-Free-Download
Because the game is still actively sold and supported by Firefly Studios, it is not classified as "abandonware." The game is officially available as the Stronghold