I Bought Minecraft Windows 10 2016-ish, but I lost that account

Hello here,

Read this article «Reset or recover your Microsoft account».

Also you can try to reset your account at this
page.

Please check under https://account.microsoft.com/billing/orders/ if your purchase for Minecraft Windows 10 shows up.

Be aware that Minecraft for Windows 10 is different from Minecraft on Xbox and also different from Java Minecraft on PC. If you bought Java Minecraft BEFORE Oct. 2018, you need to sign into your Mojang account on the Minecraft.net website, and can redeem
a code for Windows 10 Minecraft.

After you got Minecraft for Windows 10, make sure you sign in with the same account that you bought it. Open the Windows 10 store, check that's the right account in the upper right.

Then open the menu and check your library. If you bought Minecraft 10 with that account, you will find it there.

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.

I'd forgot to mention that I had bought Minecraft Java on a different account. But after losing that account I had made a new account. When I switched over, I was given Minecraft bedrock (Minecraft windows 10 edition) not Minecraft Java.

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.

Ok thank you, was just wondering.