If you are an individual user looking for a stable version of Windows 8.1, it is highly recommended to use the (or the official Microsoft download page) to get the Pro version. It offers nearly all the same features for a single user and is much easier to activate and support.
If you are a developer or have a paid subscription, you can download the 64-bit ISO directly from the subscriber portal.
Because this is a volume-licensed product, there are only two official ways to legally download the ISO:
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?
