The base game Raven Shield is currently free-to-play. However, there are specific legal ways to download its expansion and community content for free: Go to product viewer dialog for this item.
Tom Clancy's Rainbow Six 3 Gold Edition (PC) - Ubisoft Connect Key - GLOBAL rainbow six 3 raven shield free download pc
Second-hand marketplaces like eBay or Amazon still carry original CD-ROM sets for collectors. Is There a Free Download for Raven Shield? The base game Raven Shield is currently free-to-play
Legitimate third-party retailers often offer global activation keys for Ubisoft Connect at a lower price point, sometimes as low as $2.00. sometimes as low as $2.00.