You can install Windows 8.1 Preview using the ISO files (ISO) that are provided on this page............
To install Windows 8.1 Preview from an ISO file, you must first convert the ISO file into installation media stored on a DVD or a USB flash drive.
If you're using Windows 8, follow these steps to install Windows 8.1 Preview from an ISO file:
- Download the ISO (.iso) fileDouble-tap or double-click the ISO file.Double-tap or double-click setup.exe and follow the steps.Insert The Product Key When Ask The Windows And Click The ContunueProduct Key: NTTX3-RV7VB-T7X7F-WQYYY-9Y92FNow The Windows Install Automatically ...........

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Download Windows 8.1 Preview Full Version