None of these methods are approved by Microsoft. While they may technically deliver an "Activated" status in the System Properties window, they turn your computer into a compromised machine.
(If you want, I can list official Microsoft download steps or check whether Windows 8.1 ISOs are still offered by Microsoft.) windows 81 iso file pre activated
Windows 8.1 ISO File: Understanding "Pre-Activated" Versions and Risks None of these methods are approved by Microsoft
