Q: Yosemite 10.10.3 Update fails from Apple Software Update Server

MAC OS X 10.10.3 Yosemite Failed to Update after Multiple attempts

FROM current Yosemite  OS X 10.10.2 TO Yosemite OS X 10.10.3 during the last 24 hours

Tried the following Without success:

• APP Store Updater

it starts to download the update and simply quits with no indication of progress.

It returns to the "Update" button.

All the other current OS updates (such as iTunes 12.1.2 and OS X Recovery updated show "Installed"

• Stand alone Installer OS X Yosemite 10.10.3 Combo Update
• Verify/Bypass  Network Proxy to allow incoming Update OS X: Server addresses used by Software Update - Apple Support
• Reboots
• Safe Mode Boot
• Disk Utility Permission Repair

The error that the APP store update generates is

An error has occured

Can;t load data from the Apple Software Update server

Other strange effects of this attempted update have been

MAC is slow to respond to file access and saves

Will not save from Preview

iCloud Drive shows No files and status of 0 files yet iCloud drive management shows space is still occupied