Play button greyed out and cant download installer

Hi, For the past week my Play button has been greyed out as if my game is updating but it remains this way all the time. I wanted to try re installing to force it to update but I cannot, when I click the download link my browser gives me a connection error as if I am not connected to the internet, but I am able to play games from my steam library with no issues. I've tried what was suggested in this discussion: but I only get "request timed out" from cmd when i ping I then tried a full repair but after the checking process I get a repair failed message
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