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.