Windows 8.1 reached end of support on January 10, 2023, and while direct Microsoft download pages are no longer available, official ISOs can still be found via Microsoft Support or Visual Studio Subscriptions. For third-party sourcing, the Heidoc.net tool and Internet Archive are options, but files must be verified with SHA-256 hashes to ensure safety.
Why this beats an index: The Media Creation tool verifies the SHA-1 hash of the download automatically. If the file is corrupted or tampered with during download, it will restart.
Once you have a verified ISO, you need to put it on a USB drive (minimum 8GB) or burn a DVD (dual-layer for x64).
While an index of Windows 8.1 ISO files can be helpful for those looking to install or reinstall the operating system, it's essential to approach this process with caution. Ensuring the legality and safety of the sources used is paramount. For most users, exploring official channels or considering an upgrade to a more recent version of Windows is recommended.