0x80004005 code: Eroded Badlands. A File that the Windows Product Activation (WPA) requires is damaged or missing. Please reboot, verify system permissions, and make sure your operating system is up-to-date.

Edit: Updating my Java 8 from Update 361 -> 411 fixed the issue. Was working fine on 361 earlier today, so... idk why the launcher decided 361 was no longer fine to use or why that set off a Windows error on a Mac.

For whoever else runs into this error and finds this post, make sure your computer's Java is up-to-date

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I think we should track the fact that the error message is wrong and misleading. Additionally, both of the links in the popup redirect to blank pages.