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Cossacks 3 can be activated primarily on Steam, which makes the game available on Linux in addition to the exclusive special features of Valve.
If you want the full Cossacks 3 experience, so you want to buy all the DLCs in addition to the base game at once, Cossacks 3 Experience is your choice. You can access the package on Steam via the link below.
Direct links to the Steam Store for additional releases:
Additional options:
You can purchase the game from GoG.com and official website (via Xsolla).