Just for a follow up and information, Brink has posted an article regarding the re-issue of the Windows 7 Service Pack 1 [SP1] servicing stack updateKB3177467 here:
hazel123 sfc /scannow from Administrative Command Prompt
and System Update Readiness Tool (SURT) no errors?
CheckSUR.log is temporary at: C:\Windows\Logs\CBS
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
HP Desktop & Compaq Laptop
OS
Win 10 x64, Linux Lite, Win 7 x64, BlackArch, & Kali
Hard Drives
Samsung 850 Pro 256Gb,
Hitachi HDD 1Tb,
Crucial MX SSD 250Gb
Segate 3Tb USB 3.0 Ext. Backup HDD
I have an optional update (realtek driver) on another machine that won't download Other than that all fine. Both are clean installs over the last couple of days.