ATKUPD266E: The download requires an estimated RequiredSpace MB of free space, and the disk volume containing the directory "Path" has FreeSpace MB of free space remaining. Remove unused files from the disk volume or increase the size of the volume and try again. Run the "cleanupd" command to remove any update files that are no longer needed. For more information about the "cleanupd" command, enter "smcli cleanupd --help" on the command line.
This is an informational message only.