Error 0x8007000d installing windows updates

I have been dealing with this issue for about 2 weeks, following an inplace upgrade to fix a botched upgrade from windows 7 Ultimate.

I was to the point of tearing my hair out from the aggravation. I had seen this thread, and followed all the steps in trouble shooting, but like some of the other posters, ignored the steps proposed by Cytraveler on Pg.1 of this thread. after discovering that windows setup was no longer letting me do a repair install (inplace upgrade), i decided to use Windows sandbox to view those links. apparently there was an issue with 19041.6xx and 19042.6xx that actually broke windows ability to perform repair installs. I looked at my windows current version, and sure enough it was 19042.631. it was in the range of the broken version. not sure why windows setup had done this too me, as i was previously running 19042.9xx. but since i had already downloaded KB5001391 (april cum update) as part of my trouble shooting,  I opened up 7-ZIP and extracted the files to a temp directory (C:\tmp). then I opened up an Admin CMD prompt and navigated to where i had extracted those files to.

then i ran this command: "dism /online /add-package:.\Windows10.0-KB5001391-x64.cab" . Windows is currently adding the updated packages to windows. the fact it didn't error out when it tried to add the updates is very promising. once the update is installed, the ability to perform repair installs should be fixed as well.

As the saying goes, "Don't count your chickens before their hatched.". the adding of the april cum update using DISM got to 5.00% and errored out with with the now infamous 0x8007000d error code. so i am now trying to install the update listed in the link before (KB4586853) to get my windows to 19042.663, which should fix the update errors as well as the inplace upgrade errors.

Thanks for the help.

yes, well..... that last step did not turn out to work either. I ended up using the link for the batch script provided by Cytraveler and to download and examine (for safety purposes) using windows sandbox. batch scripts are simply 'batch' or series of commands that execute a series of command prompt commands. it functions exactly like the Autoexec.bat of old. Anyways. after examining the script for shenanigans, I determined it was safe. I ran the script in windows and was able to run a repair setup. what I have gathered from my little debacle: DO NOT UNDER ANY CIRCUMSATANCES DO A REPAIR SETUP WITHOUT DOWNLOADING UPDATES. I downloaded my windows setup files April 5, 2021 using the media creation tool, so they were very recent. but performing a repair install that does not download updates installs the version of 20H2 that has broken repair installs and is unable to be updated. only by allowing windows setup to fetch the updates can this problem be bypassed. so, despite the suspicious language and way Cytraveler posted, his method is indeed correct. That is, unless you prefer the nuclear option (reformat and clean install).