Glad you sorted :)

I suspect you are right, search for (windows-key+Q) "edit policy"

Not for Windows 10:
Supported Operating System
Windows 7, Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows XP

I cannot find KB2538243 offline for Windows 10 - you sure it's a windows 10 patch?
looks like all patches for Windows 10 starts with 30, available offline patches can be downloaded from here:...

Then it was a luck shot for me, sorry I could not be of better help.. Please update this post should you manage to find a solution that works for you.

The prompt in powershell should say C:\WINDOWS\system32, then you know its started from an elevated cmd..
Close that access denied window, right-click on start button and select "command prompt...

Nope sorry, using my mobile for the moment, image too big... You ran powershell from an elevated cmd prompt, yes?

Did you download the off-line update or did you let the auto-update do it's thing?

yes just leave it to finish - takes a while..

Just make sure your DISM commands are with "online" and not "offline" parameter, offline is to fix an image not currently running.
Also make sure the Group Policy Editor is updated. Mine only got...

I had a different error code with my KB3081448, but I did eventually fixed it with these instructions:

press WindowsKey+R, type gpedit.msc and press Enter.
Click "Computer Configuration", click...

Ok, I left out a step: the DISM command requires that a source for Windows 10 be available to make repairs. I forgot that I made these changes before I ran the initial set of instructions.
Try this...

Ok, I left out a step: the DISM command requires that a source for Windows 10 be available to make repairs. I forgot that I made these changes before I ran the initial set of instructions.
Try this...

You will just have to wait a while - took about 40 minutes on my i7 laptop, a progress indicator appears after a while, [20%]...
Each command will take some time to complete

Have a look at this thread, perhaps it will fix your issue as well
https://www.tenforums.com/windows-updates-activation/20186-cant-install-update-kb3081448-get-error-0x80242006.html

So WSReset.exe is the first command, it will reset the windows app store and actually launch the store on your PC.
Close the Store screen and then return to the cmd screen and just press Ctrl-C to...

Ok I got it to work. I followed these instructions:

press WindowsKey+R, type gpedit.msc and press Enter.
Click "Computer Configuration", click "Administrative Templates", click "System", and then...

I also cannot install KB3081448, but with Error 0x800f0900.
Ran "sfc /scannow",attached CBS.log