Quick answer
The StartAllBack release history first lists 25H2 support in version 3.9.15. For a current installation, review newer releases as well and verify the exact OS build. A historical support milestone is not a guarantee for every later cumulative update.
What matters for this task
When moving from an earlier Windows version, preserve a small desktop test checklist rather than relying on memory. Display scaling, default taskbar behavior, and other installed extensions may also change during an upgrade, so an appearance difference is not automatically an application defect.
Steps to follow
- Record the pre-upgrade Windows build, StartAllBack version, display arrangement, and four essential desktop tasks.
- Check current publisher notes before upgrading. Prepare a separate document backup and verify your recovery options.
- After the Windows upgrade, inspect the native desktop and the active customization version before importing old settings.
- Retest window switching, Start search, file dialogs, and multiple monitors if used. Add optional styling only after the basics behave correctly.
Verify the result
Compare results against the same four tasks from before the upgrade. Include the new OS build and any warning text in your notes.
Limits and rollback
If a problem appears, temporarily remove the shell modification from the equation. Do not repeatedly reinstall Windows merely to restore a visual preference.
Questions about this task
Is 3.9.15 necessarily the best version for 25H2 now?
No. It marks the release-history support entry; later compatible fixes may be relevant.
Should I transfer every old setting immediately?
Start with a working baseline, then reapply only the settings you need so that regressions remain traceable.
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