You can find the game on My Abandonware , which hosts older titles for download.
Since the game is considered "legacy" software, it is no longer available on major modern storefronts like Steam, though it remains a popular request on GOG.com wishlists . AURA 2: The Sacred Rings Download PC Game
Second-hand copies on DVD-ROM are often available through retailers like Playasia or eBay. You can find the game on My Abandonware