I can't download any books/files I saved with iCloud in the Apple Books app on my Mac anymore (it worked before though). Books from the Apple Books store will download fine. I can also download all books saved in iCloud with iOS without problems. There is no error message, instead the Download will apparently start as indicated in the sidebar:

Books App Sidebar

However, the download will never process at all (again, every other download works without issue).

Things I tried that didn't work:

  • Rebooted the system
  • Logged out and back in with the corresponding Apple account
  • Disabled and reenabled syncing for Books in the iCloud settings
  • Removed all ~/Library/Application Scripts/com.apple.iBooksX.* folders and rebooted
  • Removed ~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks folder and rebooted

This seems to be related to the storage optimisation feature for iCloud (maybe it is somehow stuck or blocking these downloads). It can be found under System Preferences -> Apple ID -> Optimise Mac Storage. After turning the future off and on all downloads in Apple Books now work again.

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