Hi Tocguy,
I'm Cherrelyn, I'm here to help and I know how frustrating it is when an update like KB5063523 fails after multiple attempts. Since you’ve already done DISM, SFC, Safe Boot, and confirmed that the WinRE partition has enough space, the issue may be related to the motherboard swap or an underlying update misconfiguration.
Please try these suggestion:
1. Manually reset Windows Update components**:** Open Command Prompt as admin and run these commands one by one:
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
Then restart your PC and try the update again.
2. Rebuild WinRE manually: If the update still fails, WinRE might be misaligned after the hardware change. You can temporarily disable and re-enable it:
reagentc /disable
reagentc /enable
This often realigns the configuration and allows the patch to apply.
Let me know about my suggestion, I'm here to guide you for further assistance.
Warm regards,
Cherrelyn