How to try out the Minecraft: Windows 10 Edition Beta for free

How do I get Minecraft: Windows 10 Edition Beta for free?
If you're a long-time player of Minecraft, you probably already own the original PC/Mac Java version and have a Mojang account. Good news: you can redeem Minecraft: Windows 10 Edition Beta for free if you purchased the Java version anytime in the past.
An Oculus Rift version of Minecraft was recently released, but you need to also have the Windows 10 Edition Beta to play. Oculus Rift owners out there are essentially getting two versions of the game for free!

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