You should always receive the latest updates on Steam automatically. If you don't, the best thing to do is restart your Steam client to force check for updates (this works for all Steam game btw if you even encounter the problem again). Updating files manually may cause unforeseen issues so it isn't recommended.
If you are still experiencing problems, I would suggest you switch back to the main public branch on Steam, and then validate your Steam files to make sure everything is in order.
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