Yet another KB4512506 won't install, error 80073701

Yes it's a cumulative security update.
Here's the gist of your CheckSUR.log
Summary:
Seconds executed: 8232
Found 517 errors
CSI C Mark Deployment Missing Total count: 2
CBS MUM Missing Total count: 485
CSI Missing Winning Component Key Total count: 30

I'm recommending a Repair Install. I can provide the missing mum/cat pairs it will not correct your CSI errors which the RI will do.

Repair Windows Without Reformatting.docx
If you have any questions or need anything let me know. I TeamViewer if you need it. I have everything you need to do a repair install if you don't have it, can't find it or are not comfortable with performing the steps. Make sure you have your Windows 25 character product key as you will need to reenter it to activate windows again.

Please peruse the info in the attachment above.

Bill

I'm having some serious family issues right now so bear with me on the time frames. I'm still working on another OP's missing cat/mum pairs, from several days ago. not what I want to do time-wize.

Hi mjl1297,

mjl1297 said:

To avoid days of updates, 240+ and counting, and numerous reboots, use Dism++ | New Windows Utility.

No problem with a repair install per se but the running of updates to bring it current is an issue. How much time are we realistically looking at here regarding updates? Any idea?

Repair Install is quite easy to perform. Follow Snick's instructions.

Basically . . .

[1] Run Extended Disk Cleanup [see Disk Cleanup – Extended in My => BATCH PROGRAMS [Standalone] in my signature at the bottomof this post].
[2] Backup ALL the data you don't want to lose [just in case].
[3] Make a System Image.
[4] Perform the Repair Install.
[5] Update the OS [WU's].

An alternative to DISM++ [and preferred] is SIMPLIX.

Download the latest SIMPLIX UpdatePack [for Win 7 SP1 x86-x64 / 2008 R2 SP1 x64] from here => SIMPLIX UpdatePack.

Run the UpdatePack => click Install.

It will update your OS automatically [it will re-boot a couple of times during the update process which is normal] and DOESN’T include any telemetry updates or processor checks [disables/patches detection of processor generation and hardware support when scanning or downloading updates through WU]. It installs the correct USB3 drivers [if needed] and cleans up when it has finished. It requires NO user input.

I hope this helps!

Hi mjl1297,

mjl1297 said:

Repair install failed at 99%. I give up on this one. I'll try a couple of other things but I'm tired of fighting it if that doesn't work out.

It does take quite a while!
It is always the last process that takes the time and appears to be stuck or non responsive, be patient!