What Apple has changed is unclear, but it's available if you didn't grab the first.
Samuel Axon - 10/21/2019
Apple has released a new version of its macOS Catalina Supplemental Update. The first iteration of the update was made available to Macs running Catalina on October 15.
Like last week's update, of which this is apparently a new version, this Supplemental Update promises to fix problems some users encountered when there was limited disk space available. It also fixes issues with saving Game Center data that users faced when playing Apple Arcade games offline, a Setup Assistant bug, and a problem that prevented users from being able to accept iCloud terms when logged into multiple iCloud accounts on the same machine.