So, here it is. Get it fast: https://insider.windows.com/
Some pre facts:
Privacy:
Microsoft will collect data about your installation and use of Windows Technical Preview to help us improve our products and services. See our privacy statement to learn more.
Automatic updates
Windows Update will be set to automatically install important updates as they become available. You won’t be able to turn off automatic updates in Windows Technical Preview.
Unexpected PC crashes could damage or even delete your files, so you should back up everything. Some printers and other hardware might not work, and some software might not install or work correctly, including antivirus or security programs. You might also have trouble connecting to home or corporate networks.
Also, if your PC runs into problems, Microsoft will likely examine your system files. If the privacy of your system files is a concern, consider using a different PC. For more info, read our privacy statement.
We're not kidding about the expert thing. So if you think BIOS is a new plant-based fuel, Tech Preview may not be right for you.
What about UEFI?
IMPORTANT
Basically, if your PC can run Windows 8.1, you’re good to go. If you're not sure, don't worry—Windows will check your system to make sure it can install the preview.
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Processor: 1 gigahertz (GHz) or faster
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RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
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Free hard disk space: 16 GB
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Graphics card: Microsoft DirectX 9 graphics device with WDDM driver
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A Microsoft account and Internet access
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Some PC processors and hardware configurations aren’t supported by Technical Preview.
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To access the Windows Store and to download and run apps, you need an Internet connection, a screen resolution of at least 1024 x 768, and a Microsoft account.
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After you install the preview, you won't be able to play DVDs using Windows Media Player.
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If you have Windows 8 Pro with Media Center and you install the preview, Windows Media Center will be removed.
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The preview won’t work on Windows RT 8.1 and Windows N editions.
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The preview is not available for Windows Phone.
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A small number of older, 64-bit CPUs might be blocked from installing the preview.
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If you're running Windows 7 without SP1, you can only upgrade to the preview by downloading an ISO file. If you install Windows 7 SP1, you can upgrade to the preview by using Windows Update or by downloading an ISO file.
Technical Preview is available in English, Chinese Simplified, and Brazilian Portuguese.
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If you're running Windows 8.1, Windows 8, or Windows 7 and your system language isn't English, Chinese Simplified, or Brazilian Portuguese, you can only keep your personal files when you upgrade. You won't be able to keep your apps or Windows settings.
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If you're running Windows 8.1, Windows 8, or Windows 7 and have installed a language pack or a language interface pack (LIP), they'll be removed when you install Technical Preview.
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If you’re running Technical Preview, we'll send you notifications beginning on April 1, 2015 to remind you that it’s time to upgrade your PC to a newer version.