Place extracted theme files into C:\Windows\Resources\Themes .

The short answer: Niivu is a legitimate, long-standing creator on DeviantArt with tens of thousands of followers. The tools recommended (UltraUxThemePatcher, SecureUxTheme, StartAllBack) are also widely trusted.

Since the release of Windows 11, niivu has adapted rapidly. The AIO packs now feature support for the new centered taskbar, rounded corners, and the Mica material. As Microsoft continues to update Windows 11 (and eventually Windows 12), niivu remains one of the first designers to release compatible updates. Searching for "AIO for Windows 11 by niivu" yields packs that feel more native than many default Microsoft themes.

For years, niivu has been a primary figure in the , winning awards for his "skillful eye for crisp lines and solid layouts". His goal isn't just to change a wallpaper; it’s to make the desktop experience feel entirely different—often inspired by other operating systems like macOS, Linux, or even futuristic "Windows 12" concepts. The "All-in-One" Experience