Deals Team Fortress 2 Not On Steam in year. Note: This process will not affect your currently installed games. You will automatically be upgraded to have a premium.
Then, launch Steam.exe from within the Steam installation folder, and not from a pre-existing shortcut. This did appear to fix it for me although it does still happen on occasion. (not very often though). All times on the site are UTC.
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Open your main Steam client window.
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If you've never played before, going through some training is highly recommended. Click OK to try again, or enter and alternate path to a folder containing the installation package "SteamInstall.msi" in. An ongoing analysis of Steam's player numbers, seeing what's been played the most.