[Mac] Update started but stuck at "Initializing"

As the title says, I was playing earlier today, logged off, and when I returned there was an update available. I clicked to start it (not much choice, it replaces the Play button) and it has been stuck at “Initializing” with 0% progress since.

Any help/information would be appreciated.

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I got the same problem…

This has been going on for years.

The simplest way to resolve this is to close the battle.net application, download the battle.net installer and install it again.