The problem is Steam is a remote service. While at one point they were considered fairly friendly to the gaming community, this kind of move reveals them to be more of a kind-hearted evil dictator that is fine as long as you play by all their rules. It's not just that Valve is discontinuing the release of a client that runs on Win7, it's without this client games will no longer run. Regardless of if the game works just fine on your machine, if it requires steam's DRM it will continue only as long as the client's last login is valid. Once that validity expires, and/or if the client can no longer call home, the DRM assumes you no longer have a license for that application and it quits working. In this case steam's only option for you is a passive-aggressive flippant "Well, you should upgrade to win10!" instead of an "Ok, here's a local DRM stub tied to your purchases only that will continue as long as your hardware holds out." The root cause is valve went to using Chromium as their front-end some time ago instead of being good programmers and writing their own client like they used to. Chromium no longer supports Win7, so valve no longer supports it either. The items you paid for and that work just fine on your machine won't work anymore because they can't call home.