Look for posts with high upvotes and comments confirming the hash matches Microsoft’s official values.
Microsoft intentionally hides Windows 8.1 downloads, but they still exist on their servers. Here is the legal hack: windows 8 iso file download google drive
If you already have a Windows 8 product key, download Windows 8.1 (it’s free to upgrade from 8) using official tools. If you do not have a key, remember that Windows 10 and 11 are still officially available for free (with a watermark) and are far more secure. Look for posts with high upvotes and comments