Currently, there is no official digital distribution agreement for the game. While original physical DVD copies exist, most modern PCs don't even have disc drives. Because the game is "abandonware" (no longer sold or supported by its publisher), players feel justified in seeking it out on unofficial sources like Steamunlocked.
You will end up spending three hours on forums trying to find fan-made patches (like "Battlestations Pacific Unlocker" or "Xliveless") just to make a pirated copy work.
: Clicking "download" often triggers pop-ups for fake installers or malware-laden ZIP files. Only downloads from the specific UploadHaven link are even potentially legitimate, though still high-risk.