How do I play COD modern warfare 2 without Steam?

I brought COD MW2 from eBay. I just want to play it alone without going online. The seller registered it to Steam and I can't get any reply from Steam Support about how to have it switched to my Steam account or single player mode. Is there a way to load it straight from the disc without Steam? Could you please answer in plain language that I can understand? Not very computer literate!!

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TwoDee says

5 years ago
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