Fixed it, the user friendly way!
First get the update error fix tool, run as admin, complete, restart.
https://support.microsoft.com/en-gb/help/10164/fix-windows-update-errors
Then get the update manually for your system.
https://www.catalog.update.microsoft.com/Search.aspx?q=kb4056892
Run it.
Restart.
Job done :)
Nice, but My problem seems to be that two updates are queued, the earlier one for Adobe,
and this one. I have discovered that my system "thinks they are installed" but also queues them for installation. The catalog of installed updates shows these updates with blank dates in the list of installed updates, but I was able to delete them, then
re-list and they were gone. but when MS Update, after running your troubleshooter, tried to reinstall them, the same impasse occurred! MICROSOFT IF YOU READ THIS, THERE IS A BUG IN THE PROCESS!
Yes......Totally agree .....Microsoft (what are you doing about the bug?) I've given up with the updates (1709 etc.).
Try
Disconnect your Broadband Connection (Switch off router or disconnect network cable between router and Computer.
Do a Clean Start, sometimes called a cold start, by disabling all the non Microsoft programmes that run at start up in the Task Manager and in msconfig (System Configuration). Make a note of all the ones you disable so you can re-enable them at the end.
Restart computer and log on.
Click on
Start
Settings
Security & Update.
View installed update history
Uninstall updates
The offending Flash Player updates will appear in this list, but will NOT have an install date.
Select one, and uninstall it. It will take a bit of time and initially you may not see any indication unless you have the Task Manager open on the Processes tab, where you will see the Windows Uninstaller using CPU percentage)
Be patient; Once uninstalled, you will get a message with an option to restart or restart later.
Select later and uninstall any other update that does not have an install date
After you have installed all the ones that do not have an install date, select the restart option
Check Windows update again, and messages about restart required should not appear.
In the list of installed updates, all should have an install date.
Keep the Windows Update window open, and switch on router or reconnect network cable.
Windows should now search for updates and update only the latest Flash Player update. If you use Windows Defender, you will see the latest updates downloading and installing first then any other updates available.
Once Windows Update requires a restart, use the restart button on the Windows Update page. (I have found out that if you use the normal route of Start, Power, Restart that it does not necessarily restart and complete the install.
Once restarted re-enable the items in Task Manager and System Configuration
Then shut down computer completely, so everything is off,
Restart