No you just log in and play the demo
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To get Minecraft for free, you need to download it on Xbox.
Well, you can not technically download a Minecraft Demo, but you can still play the free version of Minecraft (classic version) at the homepage of the official Minecraft website.......... It should be under the "download game" button on the homepage. Have Fun :D
You can get free Classic Minecraft from the minecraft website, and play the demo version there too for free.
You delete the trial from your hard drive and download it again
You can't. It's illegal, However, you can play the free version on Minecraft's home page or download the demo. The links can be found under "Sources and related links" below this answer.