Microsoft maintains a dedicated page that generates download links upon entering a valid product key. Follow these steps:
: The site will generate a link to download the ISO file directly to your computer. Installation Requirements windows 8.1 pro download
Make sure you have a genuine Windows 8.1 Pro key, not a Windows 8 Pro key (though the latter should work if you are upgrading from within Windows 8). Also ensure you are downloading the correct edition (Retail vs. Volume License). Microsoft’s download tool accepts only retail keys. Microsoft maintains a dedicated page that generates download
If you still choose to use Windows 8.1 Pro: Also ensure you are downloading the correct edition
Use Windows’ built-in disc burning feature or ImgBurn to write the ISO to a dual-layer DVD (if the ISO exceeds 4.7 GB, though standard Windows 8.1 Pro fits on a single-layer DVD).
: Because Microsoft no longer supports Windows 8.1, your system will be more vulnerable to viruses and malware. It is highly recommended to upgrade to Windows 10 or Windows 11 if your hardware supports it.