In the past, Microsoft offered a version of Windows 8.1 Enterprise for IT testing. However, Microsoft has officially retired the download page for this evaluation. While you may find third-party sites hosting these "Eval" ISOs, they are no longer supported and will expire after 90 days, requiring a full reinstall of a licensed version. Safety Warning
Looking for a can be a bit tricky because, unlike the "Home" or "Pro" versions, the Enterprise edition was never meant for general consumer purchase. It was designed specifically for large organizations and IT professionals. What is Windows 8.1 Enterprise? Download W81 Enterprise x64 ISO
Even with a clean ISO, you still need a valid KMS or MAK volume license key to activate the software. A standard Pro or Home key will not work. Recommended Alternative In the past, Microsoft offered a version of Windows 8