Windows 11 update KB5065426 won't install for some users due to error codes 0x800F0991, 0x800F0922, 0x80071A2D, 0x800F081F, ...

Windows 11 September KB5065426 update is not installing with multiple error codes, leaving some September 2025 updates stuck.

If you've encountered a problem with a Windows upgrade, you know how maddeningly unhelpful Windows error messages can be. These are my favorite troubleshooting tricks.

Windows 11 KB5065426 won't install due to several errors, such as 0x800F0991, 0x800F0922, 0x80071A2D, 0x800F081F, and more.

This month’s collection of fixes from Microsoft includes 86 patches — but at least there were no zero-day bugs.

A few readers reported that the upgrade ended prematurely with an unhelpful error message that reported the installation had failed. In most of these cases, the cure involved downloading a fresh copy ...