Approximately 500 million users have PCs that qualify for Windows 11 but have not yet upgraded. Microsoft has announced that all supported systems can download and install Windows 11 version 25H2, available for both Windows 11 and Windows 10 users with the necessary system requirements. The update may encounter installation errors, such as the 0x80070306, and users may experience issues like disruptions to dark mode in File Explorer and complications with Intel Arc GPU drivers. Microsoft is working on a resolution for these problems, but a specific timeline for fixes is not provided. Users can check for the Windows 11 upgrade by going to Settings > Windows Update and selecting "Check for updates." This feature is exclusive to qualifying PCs.