Windows 10: Why do i have to buy minecraft again

a while ago i bought minecraft on my laptop but when i got my new pc it says i have to buy minecraft again even though im on the same account ive always used

:)

 

Homegroup For Minecraft Servers Or What?

It looks as if the existing minecraft server will use the new system without modification - It needs to be able to access the computers on the network in a two way link, which is the standard for Workgroup and Homegroup

There is a complete step by step available, if you have any issues ...

Tutorials/Setting up a server – Official Minecraft Wiki

It's not something I have any direct experience with but a quick read suggests to me that you will not need to do Much if any reconfiguration of the existing server

 

Buy Minecraft

Assalamualaikum Sir,I want to ask about Buying an Application.So i am planning to buy Minecraft soon,but in windows store payment it require Debit/Credit Card and i dont have that card because im 18-.So the question
is "is it allowed to buy Minecraft on local online shop?(Original).I just found a seller that sell Mojang account and he say that if you buy that mojang account,You will get the Minecraft Win10 Code and of course he sell it more cheaper than in official website
and also the payment is easier than Microsoft Store.

 

After redeeming minecraft windows 10 gift code this happens.


Okay I went ahead followed the instructions to the "Letter" every single step and checked it multiple times.
And when i finally install minecraft i get a trial and time limit 90 minutes and it says "buy"
HELP??? This shouldn't of happened! Trying to get free windows 10 minecraft and it wouldn't work!!
(this was done in a virtual machine but performance was better than acceptable so minecraft ran smooth regardless. shouldn't effect it?)

I tried and it just wouldn't work. Tried uninstalling minecraft and reinstalling it and restarting. Nope. Still wants me to buy it. and it's still the trial.
I don't know where else to get help from because the microsoft forums don't even reply to me and mojang said it's not their problem.