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Microsoft discontinued mainstream support for Windows 8.1, but they still offer the official ISO download tool. Here is the safest method: download windows 8.1 64 bit google drive
Note: To avoid broken links, here is a verified shared link. If the link is dead, search for "TechBench Windows 8.1 ISO" as an alternative. Disclaimer: This article is for educational purposes
Large ISO files (approx. 4 GB) can sometimes corrupt during upload to personal cloud drives. download windows 8.1 64 bit google drive