Windows Update screen won't open: A 15-minute recovery procedure and precautions tried before an in-place upgrade (approx. 3 hours)

I work in internal help desk support. Recently, while providing remote support for an employee's PC, when I opened "Settings" ...
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Tested: Windows 11’s 2026 feature update is just 174KB, but your PC still needs 6.5GB for Windows 11 26H2 if it’s on 23H2

I downloaded the Windows 11 26H2 enablement package, KB5121794, and it's just 173KB. But 23H2 PCs need a 6.5GB upgrade, and ...