Yesterday Microsoft Lunched Windows 8.1 Preview to upgrade your Windows 8 to Windows 8.1. And I confirmed you that Micosoft soon going to launch the ISO update file so that you can update your Windows 8 from DVD by booting unless downloading update file from Windows store.
And updating from ISO file is easy and good for those people have slow internet. And you can use the same DVD to update your other Windows 8 PC. This Windows 8.1 Preview ISO launched in both x86 (32bit) and x64 (64bit). And available in many languages, including English, Arabic, Chinese (Simplified), Chinese (Traditional), French, German, Japanese, Korean, Portuguese, Russian, Spanish, Swedish and Turkish.
Here is the free direct download links and Product key of Windows 8.1 Preview ISO file
Product Key: NTTX3-RV7VB-T7X7F-WQYYY-9Y92F
Free Download Windows 8.1 Preview ISO 32bit (x86) English here 2.8GB Free Download Windows 8.1 Preview ISO 64bit (x64) English here 3.8GB
Free direct Download Link of Windows 8.1 Preview ISO with Key
Free Download Windows 8.1 Preview ISO Both 32bit & 64bit