How to re-enable DU Meter Taskbar Band after upgrade?

When you upgrade to a new major version of DU Meter (e.g., from 8.x to 9.x), the Taskbar Band will be closed to allow the program files to be replaced, and there is no Microsoft-approved way to re-enable it automatically afterwards. Therefore, it should be enabled manually:

On Windows 10

Right-click on any empty space on the Windows taskbar, select the top "Toolbars" submenu, and then select "DU Meter" from that submenu.

On Windows 11

Windows 11 has no taskbar band support of its own. If you use StartAllBack or ExplorerPatcher, re-enable the band the same way as on Windows 10. See Windows 11 Taskbar Band Not Working.