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Your best bet is still the official Microsoft Software Download page.
Avoid "third-party" sites that force you to pay or use unknown downloaders, as these often contain malware. 🛠️ How to Download and Prepare Windows 8.1 English ISO File - Microsoft Q&A windows 8.1 iso download
This tool remains the gold standard for acquisition. It allows users to select the language, edition (Core, Pro, or Single Language), and architecture (32-bit or 64-bit). It creates a bootable USB drive automatically, negating the need for third-party software like Rufus for most users. Your best bet is still the official Microsoft
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