https://thenextweb.com/microsoft/2018/09/21/microsofts-windows-10-october-2018-update-cant-check-storage-space-heres-what-to-do/

Uh-oh, it looks like someone forgot to include the “check to ensure there’s enough storage space before installing” feature in the October Windows 10 update.

As PC World reported yesterday, Microsoft quietly published a support document indicating people who attempt to run the impending October update on Windows 10 machines could find themselves rather frustrated if they don’t have enough available storage.