No, that's not the exact error message, I want you to copy and paste what you're seeing and then post it. No offense, but I don't like people's paraphrasing of error messages because quite often it's way off.
It appears either those files weren't on your hd when the patching started, or they were somewhere where the patch program couldn't find them. Are you/were you able to see where those files are sitting on your hard drive? In your war3 folder perhaps?
Have you ever uninstalled/reinstalled the game into a different directory?
This error is coming up because the Mac version of the beta patch isn't available yet. Keep an eye on this forum for an announcement about when it's ready:
Reddit, Slack, Google, Facebook, Instagram — these companies use our data — directly or indirectly — to train the next generation of AI language models. Yet, I don’t remember anyone asking our permission, and in doing so, these companies have proven the adage that customers’ data is their main...
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It never fails that as soon as I say something about the bots they come back - this time they are under a whole new IP range - one thing in common though, Chinese!