This error is not specific to the Mac platform, and there's a support knowledge base article on it. It basically states that you should try to repair the game via the Launcher's Game Options dropdown menu (the one with the cogwheel).

If that doesn't work, it gives somewhat broken instructions on how to try another repair, or rather, re-download of the game client's depot files on the Mac. There is no such folder as stated (User/Applications/Zenimax Online/Launcher.app), and the depot isn't in the Launcher.app folder as well. You'll either want to move

/Applications/ZeniMax Online/The Elder Scrolls Online/depot (NA MegaServer)

or

/Applications/ZeniMax Online/The Elder Scrolls Online EU/depot (EU MegaServer)

Once you've done this, the Launcher will download the latest game files form the CDN, hopefully fixing any issues that crept up with patching.

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@ZOS_MollyH, could someone please have a look at the FAQ in question and correct it?

ZOS_MollyH wrote: »

Hey @KhajitFurTrader !

Thanks for letting us know! Just to clarify, the launcher.app should be located in the User/Applications/Zenimax Online/ folder, and right-click / show package contents should properly open up the location including the depot folder.

It can also be reached using the alternate instructions you've provided. We'll be happy to take a look to clarify the wording a little further in the FAQ

The default location for the Zenimax Online folder is not in User/Applications, it's in Applications.

Also, there is no Depot folder in the Launcher.app contents package, it's in Applications/Zenimax Online/The Elder Scrolls Online.