Can you get Minecraft for Windows 10 edition for free with gamepass or already owned...

I own minecraft "windows 10 edition" on xbox one but isn't availabile on windows 10....

There is no "Windows 10 Edition" on the Xbox One.

On the Xbox One, there was a "Minecraft Xbox One Edition" but that has been replaced with just "Minecraft".

As the others already said, "Minecraft" is not a Play Anywhere title, so owning "Minecraft" on the Xbox One, doesn't give you "Minecraft Windows 10 Edition" on the PC.

However, if you own Minecraft Java Edition on PC, you can log into your Mojang Account on PC, and can get a code for the Windows 10 Version.

As someone who has Minecraft for both Xbox One and Windows (both Win 10 version and the Java version) I can answer this.

Poli5hesBubble: When the Windows 10 Edition (Windows Store Version) of the Minecraft entered public Beta in 2015/2016, owners of the pre-existing Java version were given a key to download and own the Windows 10 Edition (Windows Store Version) for free, as
they already owned it for PC (in Java form). However, this does NOT work in reverse; if you bought the Windows 10 Edition (Windows Store Version), you will NOT be given a free copy of the Java version.

KyleCBlanchard: Similar to the answer for Poli5hedBubble, if you own the Java version from Minecraft.net, you should be able to go to your Mojang account, log in and see a key that, once entered into the Windows Store or at redeem.microsoft.com, will allow
you download the free copy of Minecraft: Windows 10 Edition for free.

It's being added today. Games are typically added to Game Pass a little later than now so you'll want to check back.

I am trying to say, Do you get the paid version of Minecraft? Because it tells me to buy Minecraft, I already have the game downloaded from Game Pass, It tells me to buy.

It's being added to Game Pass for PC today so you will be able to play it for free with Game Pass. You would still need to purchase it if you want to continue playing without Game Pass.