You can legally purchase and download the game from several major platforms:
Do not let anyone convince you that piracy is the only way to get old games. Dungeon Siege III is alive, well, and available via perfectly normal, safe, and legal download links. Dungeon Siege III -Normal Download Link-
: Console players can find the Xbox version of Dungeon Siege III through the official Microsoft store. Third-Party Digital Retailers You can legally purchase and download the game
To save you from endless Googling, here is the for Dungeon Siege III : and available via perfectly normal
is through established PC gaming platforms. These versions are optimized for modern systems and include cloud saves and achievement support.
If you are looking for a deal, you can buy a digital key from reputable retailers to activate on Steam: