If you have enabled the internal Mac firewall, this may also interfere.
Steam Subscriber Agreement. Steam Support. Games do not run after 'Preparing to Launch' My game isn't launching. How can I resolve this? For Windows users: Update your Windows install Update drivers for your computer Verify your game cache files Disable non-essential software Check the game's system requirements For Mac users: Update your Windows install Please visit Microsoft's How to keep your Windows computer up-to-date page and make sure your version of Windows is fully updated.
Update drivers for your computer Make sure you have the latest drivers for the various components of your machine.
Steam won't open Help! - Apple Community
Verify your Game Cache files If a game won't launch, this is often caused by corruption in your extracted game files. This has been nearly 4 hours now I've been trying. Not happy. The mac model should not matter as the game was working completely fine last night.
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Steam Not Opening? Here Are Some Fixes
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The Steam application is required to play all games purchased through Steam, as well as retail games registered to Steam. Just dragging the Steam program to the Trash will not fully uninstall Steam.
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The additional steps below are required. The following instructions will describe how to remove Steam and, optionally, all your games from this computer. If you complete all the steps and decide to reinstall Steam later, you will need your account name and password to reinstall your games. If you don't want to lose any game data: