Last week, Microsoft had a change of heart and decided to publish the RTM flavor of Windows 8.1 on TechNet and MSDN, even though it initially planned to keep the OS update locked until October.
Now it turns out that only volume license customers with active Software Assurance, which includes access to TechNet, will be allowed to download Windows 8.1 Enterprise earlier, while all the other licensees will have to wait until next month.
ZDNet is reporting that subscribers of the DreamSpark Premium service can also download Windows 8.1 from MSDN, but standard DreamSpark customers are locked out from the service and forced to wait until October.
Microsoft has already announced that Windows 8.1 will go live on October 18, but Windows 8 adopters will be allowed to download the update from the Store free of charge.
There are plenty of leaked ISOs already up for grabs from file-sharing services, but Microsoft recommends everyone to wait and get the official builds.