Free Windows 8.1 RTM Download ISO and Zip from Microsoft
Download Windows 8.1 RTM, Visual Studio 2013 RC and Windows Server 2012 R2 RTM Today. Check out the new Windows Store app samples available for the Windows 8.1 Preview! To save time, you can also download all the samples at once time with the Windows 8.1 app samples pack.
– Get the headers, libraries, and tools you need to create apps for Windows, in the language of your choice. (Includes the Windows App Certification Kit.)
– Windows 8.1 RTM is now available to MSDN subscribers. With Windows 8.1 RTM and Visual Studio 2013 RC, you can make progress on your new Windows 8.1 apps, and you can verify that your existing apps work the way you expect them to on Windows 8.1.
The Windows Store will open for onboarding of Windows 8.1 apps on October 18. You will need to use RTM versions of Visual Studio, Windows 8.1, and any services to refine and submit your app to the Windows Store.