I've had one report that copying the entire Steam CK2 folder from another machine got that customer working (in his case, from a friend's Steam account).
Do you have access to a different computer to try the game on? It would be very interesting to see if it happens there too - that will help determine if it's a Steam account issue or a local computer issue.
Having the same issue on Windows 10 (attached is a DxDiag). Don't have another PC handy but just tested on a friend's Mac with my Steam account and it installed no problem.
So doesn't seem like it would be a issue then with the account, going to see if I can get my hands on another PC later on and will give copying over the files a try if I can.
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