I've been running the latest big Windows 11 cumulative update for a week with no issue's even though I don't use any of the main AI features. ->  https://www.bleepingcomputer.com/news/microsoft/windows-11-kb5032190-update-enables-moment-4-features-for-everyone/
 
Also the latest .Net Framework cumulative update -> https://www.elevenforum.com/t/kb5032007-cumulative-update-net-framework-3-5-and-4-8-1-22h2-and-23h2.19804/
No issue's to report with either of these updates after a week.

2 new Windows 11 updates with reported issue's installing.  KB5034123 Cumulative update & KB5033920 cumulative update for .Net framework.  I originally tried installing them together which failed.  I then updated just KB5033920 which installed fine after reboot.  I then tried to install KB5034123 again and it failed.
 
I haven't attempted any of the fixes mentioned in this video yet, but here it is ->  https://www.youtube.com/watch?v=bZsgJIWUC2s
 

bdary
2 new Windows 11 updates with reported issue's installing.  KB5034123 Cumulative update & KB5033920 cumulative update for .Net framework.  I originally tried installing them together which failed.  I then updated just KB5033920 which installed fine after reboot.  I then tried to install KB5034123 again and it failed.
 
I haven't attempted any of the fixes mentioned in this video yet, but here it is ->  https://www.youtube.com/watch?v=bZsgJIWUC2s

Both of those updates installed earlier today without issue for me. At least no issues so far... 
 

Nereus

bdary
2 new Windows 11 updates with reported issue's installing.  KB5034123 Cumulative update & KB5033920 cumulative update for .Net framework.  I originally tried installing them together which failed.  I then updated just KB5033920 which installed fine after reboot.  I then tried to install KB5034123 again and it failed.
 
I haven't attempted any of the fixes mentioned in this video yet, but here it is ->  https://www.youtube.com/watch?v=bZsgJIWUC2s

Both of those updates installed earlier today without issue for me. At least no issues so far... 
 

I tried a few things this morning and attempted to install that update again with no luck.  It's unclear how wide spread this issue is, but good to hear both updates installed as they should for you. 

December's Security patch, seems to have made a small negative impact to performance on my W10 Pro rigs

I guess no one here is running into "Windows 10 KB5034441 security update fails with 0x80070643 errors" "Microsoft KB5034441 Windows 10 security patch for BitLocker bypass is leading to errors and has a complicated fix".
I myself have not of the systems I have updated, and I checked the size of the WinRE partition and my system has a 1000 MB with another that was 827 MB … unsure how they got to that size?
 
Edit: Found this interesting,

The disk partition for Windows RE tools must be at least 300 megabytes (MB). Typically, between 500-700 MB is allocated for the Windows RE tools image (Winre.wim), depending on base language and added customizations.
The allocation for Windows RE must also include sufficient free space for backup utilities to capture the partition. Follow these guidelines to create the partition:

• For Windows operating systems prior to Windows 10, version 2004 or Windows Server 2022:
  
  • If the partition is smaller than 500 MB, it must have at least 50 MB of free space.
  • If the partition is 500 MB or larger, it must have at least 320 MB of free space.
  • If the partition is larger than 1 gigabyte (GB), it must have at least 1 GB of free space.
• For Windows operating systems later than Windows 10, version 2004 or Windows Server 2022, the partition must have at least 200 MB of free space.
  
• The partition must use the following Type ID:
  DE94BBA4-06D1-4D40-A16A-BFD50179D6AC
  
• The Windows RE tools should be in a partition that's separate from the Windows partition. This separation supports automatic failover and the startup of partitions that are encrypted by using Windows BitLocker Drive Encryption.
  

Source: Disk partition requirement for using Windows RE tools on a UEFI-based computer Aug 31 2023
 
 

The December update for W11 killed my old CAD program.  I hope a future Windows update will fix whatever broke or I may have to finally update it.

New Windows 11 22H2 & 23H2 Cumulative update KB5034765.  No issue's to report so far after a few hours of use.
 
https://www.neowin.net/news/windows-11-patch-tuesday-update-kb5034765-is-here-for-23h2-and-22h2/
 
Also a Windows Malicious Software removal Tool KB890830 update.
 
https://www.catalog.update.microsoft.com/Search.aspx?q=KB890830
 
 

Windows 11 Pro 23H2 (22631.3155)  
 
Windows 10 Pro 22H2 (14056.40446) 

EVGAuser97428
The December update for W11 killed my old CAD program.  I hope a future Windows update will fix whatever broke or I may have to finally update it.

If you haven't tried yet, you can try running your CAD program in "Compatibility Mode".
 
Open your File Explorer > locate the folder your CAD program is in and open it > right click on the .exe file that runs the program > Click on the Compatibilty tab > Put a check mark in the box to "Run this program in Compatibilty mode for..."  select the last OS from the list where CAD ran well.  Probably Windows 7 or 8/8.1, click apply/Ok and see how it works out.