As of early 2026, Microsoft has largely removed public download links for Windows 8.1 ISO files from their main software download pages
: At least 4GB of free space on your computer, a USB drive, or an external drive. download windows 8.1 disc image -iso file- - microsoft
Security Warning: Avoid downloading ISO files from unofficial third-party sites or "black websites," as these files may be corrupted or contain malware. As of early 2026, Microsoft has largely removed