Choose Windows 8.1 Pro (or Windows 8.1, then enter a Pro key during installation).
Once downloaded, verify the ISO’s integrity by checking its SHA-1 hash against Microsoft’s published values (searchable online via Microsoft Docs). Then: windows 8.1 pro iso microsoft download
If downloading from a non-Microsoft site, always check the SHA-256 hash of the file against known official hashes to ensure it hasn't been tampered with. Important Considerations for 2026 Choose Windows 8
Microsoft maintains a download page for Windows 8.1, but it typically provides a generic "Windows 8.1" ISO. You can select "Pro" during the installation process. but it has been deprecated. Today
You must register to download, and it requires a clean installation. 2. Visual Studio Subscriptions (MSDN)
If you are looking for the Setup executable rather than an ISO, or if you want to upgrade a current PC:
Microsoft once offered a dedicated “Media Creation Tool” for Windows 8.1, but it has been deprecated. Today, the same tool for Windows 10/11 will not work for 8.1. Stick with the web-based ISO download method above.