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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
Actually I did not know that. It pisses me off that I bought Axis and Allies Online on Steam instead of GOG one week before it became unplayable on Steam on my Windows 7 system. I will ALWAYS check GOG from now on.
You agreed to a TOS. Not reading it was your fault. I'll admit that extremely long TOSes are kind of a dark pattern, but you did agree to them.