The Internet Archive (Archive.org) serves as the venue for this trade. Because Microsoft officially ended support for Windows 8.1 in January 2023, finding official ISOs through standard channels has become difficult for average users. Furthermore, Microsoft does not distribute "Lite" versions; these are community creations.
If you want a legitimate, lightweight Windows-like environment or safe ways to run older Windows versions, here are lawful alternatives and steps: Windows 8.1 Lite Archive.org
Windows 8.1 Lite is a modified, unofficial build of the original Microsoft operating system. Unlike the standard version, which can be resource-heavy, these builds are "debloated" by removing non-essential features and background services. The Internet Archive (Archive
Use a still-supported, lightweight OS