NEW Update to 2103 installed - hotfix rollup kb10036164 stalled

[Gleep52]

I installed 2103 on 6/8 this year. I didn't check the status - as it said everything completed normally - manager client booted me out, updated, and I reconnected and have been using it ever since without any glaring faults. New programs push out and install fine, PXE boot and imaging still functions, etc.

I saw the hotfix available and started the installation of that but got side tracked with other duties. I come to find it still say "installing" as it's "state" but there is no progress to show when I click "Show Status" - it's not even listed to view - says "No items found."

When I view the status of the previous 2103 update, it says it is still doing the post cleanup tasks of deleting the client cmmsetup.exe file from the clientupgrade folder.

INFO: Failed to delete the file \\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe (LastError=5). Will try to move it to a temporary file.    SMS_HIERARCHY_MANAGER    7/25/2021 1:58:33 AM    11976 (0x2EC8)
ERROR: MoveFileExW(\\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe, \\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe_@{36a0ee55-daf6-42e4-a861-e5a01625c36f}) failed.  (LastError=5)    SMS_HIERARCHY_MANAGER    7/25/2021 1:58:33 AM    11976 (0x2EC8)
INFO: Failed to zap the file \\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe (LastError=2). will try to copy file again.    SMS_HIERARCHY_MANAGER    7/25/2021 1:58:33 AM    11976 (0x2EC8)
INFO: Failed to copy the file [\\?\C:\Program Files\Microsoft Configuration Manager\CMUClient\ccmsetup.exe] to [\\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe] (LastError=5).    SMS_HIERARCHY_MANAGER    7/25/2021 1:58:33 AM    11976 (0x2EC8)
ERROR: Failed to update the client upgrade package    SMS_HIERARCHY_MANAGER    7/25/2021 1:58:33 AM    11976 (0x2EC8)

I tried to look in the ClientUpgrade folder and got the usual "you don't have permissions" error with most sccm folders. That got me thinking - we disabled the account that SCCM originally was installed with for security reasons. I added the replacement account to the root configuration manager folder as the owner and propagated that through the subfolders. Then I ran a site reset. I also moved the cmmsetup.exe file out of the "ClientUpgrades" folder so it didn't have to delete the file and now I am only getting the last three error lines (still cannot copy file)

INFO: Failed to copy the file [\\?\C:\Program Files\Microsoft Configuration Manager\CMUClient\ccmsetup.exe] to [\\?\C:\Program Files\Microsoft Configuration Manager\ClientUpgrade\ccmsetup.exe] (LastError=5).    SMS_HIERARCHY_MANAGER    7/25/2021 2:13:33 AM    11620 (0x2D64)
ERROR: Failed to update the client upgrade package    SMS_HIERARCHY_MANAGER    7/25/2021 2:13:33 AM    11620 (0x2D64)
WARN: It fails to process the client content in the update package 8F4FEBB7-F5C4-4D73-893F-29042015727F. Will retry in next cycle.    SMS_HIERARCHY_MANAGER    7/25/2021 2:13:33 AM    11620 (0x2D64)

When I try to move the file myself manually I get "Destination Folder Access Denied" and "You need permission to perform this action" even though I am the owner of both folders and my domain user account has full permissions of both folders and files... kinda weird.

Anyone have some insight how to fix this?

Edit: I'm presuming if I can finish the post installation tasks to the original 2103 update, that my hotfix rollup might kick off - but if THAT doesn't work - I'll be looking for ideas there too