You cannot buy on Steam, GOG, or Epic Games. Activision abandoned the license years ago. The game is officially "abandonware." Here is the only way to run it on Windows 10 or 11.
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Install the game but do NOT launch it. The original CD check fails on Windows 10. You will need a "No-CD Crack" to bypass SecuROM, which Microsoft has blocked for security reasons. You cannot buy on Steam, GOG, or Epic Games