Quick answer
The publisher history lists formal 26H2 support in StartAllBack 3.9.26 and a related dark-mode fix in 3.9.27. Review the current release before installation and check your complete Windows build rather than assuming an earlier package covers every 26H2 change.
What matters for this task
This compatibility note was reviewed on October 29, 2026. It separates a support announcement from a specific interface correction: if your problem is dark dialogs, that is a different test from whether the taskbar loads. Keep the version history attached to the symptom you are investigating.
Steps to follow
- Record winver output and your installed StartAllBack version. Note whether the device uses a preview branch or a general release.
- Read the current publisher history, including entries after the first 26H2 support announcement. Do not use a search-result snippet as the complete changelog.
- Save work and update through a trusted source when needed. Keep the existing settings record before trying a different style.
- Test dark and light Explorer dialogs, taskbar menus, Start search, and a sign-in cycle separately. Mark which component fails.
Verify the result
A useful result identifies the specific component, Windows build, application version, and reproduction steps. “26H2 broken” alone is not enough to distinguish problems.
Limits and rollback
Use a simpler style or disable the affected component while investigating. Avoid copying workaround DLLs from unrelated machines or replacing protected Windows files.
Questions about this task
Does the first 26H2-compatible release include later fixes?
No. A later entry may address a separate issue, which is why the full release history matters.
Can the same setting look different after a Windows update?
Yes. Retest the relevant shell component and compare the build and software version before changing unrelated settings.
Primary sources
Publisher claims and Windows procedures are linked below. The comparison and diagnostic steps are editorial guidance, not a claim of hands-on Windows testing.
Windows 11 download · Review compatibility and the publisher’s license terms before installing.
Download for Windows 11 File source and installation notes