Microsoft has released Windows 8 RTM or the final version to Technet and MSDN subscribers just a couple of hours ago. If you are not a subscriber, you can still get your hands on a 90 days trial version of Windows 8 Enterprise edition.
In order to use this evaluation, you must register and the product must be activated online with Microsoft-hosted activation and validation services within 10 days of installation. Failure to do so will result in the desktop background turning black and you will see a persistent desktop notification indicating that the system is not genuine. The PC will shut down every hour losing unsaved work.
No product key is required for the evaluation version. Once installed, you cannot upgrade to another Windows version even if purchase Windows 8 after they become available post October 26. Microsoft will also not provide technical support for this software.
Once you activate, you have up to 90 days to use the software. You can track the amount of time you have left by referring to the "watermark" in the lower right corner of the Windows desktop. Once the edition expires, after 90 days, you will need to replace the operating system on your test computer and reinstall all your programs and data. It is not possible to upgrade the evaluation to a licensed working version of Windows 8. A clean installation is required.
The Windows 8 Enterprise edition is available in both 32-bit and 64-bit versions in multiple languages: Chinese (Simplified), Chinese (Traditional), English, English (UK), French, German, Italian, Japanese, Korean, Portuguese (Brazil), and Spanish. The Windows 8 Enterprise Trial will be available for download until August 15, 2013.