Uninstall Windows 10 Reinstall Windows 8.1 same license (Not a rollback).

Windows 8.1 LogoHello guys
I'm happy to announce that I found a way to get back to Windows 8.1! Not from the rollback option or the recovery! My way is uninstalling Windows 10. And reinstalling Windows 8.1 using the same license!




It's not a rollback. I had Windows 10 for over a month, plus I removed the Windows.old and reinstalled Windows 10. So no recovery options were available. What I did was an old fashion uninstall / reinstall job with some license work.
The method is very simple. I'm going to list somethings you need first:
  1. Make sure your Windows 10 works.
  2. Make sure you are using the same version of Windows 8.1 you had before.
  3. You must be online the whole time.
Your Windows 10 has to work because we are going to "Uninstall it". If it doesn't work for any reason DON'T INSTALL WINDOWS 8.1 RIGHT AWAY. I warned you!!
You need to repair or fresh install your version of Windows 10 in order to complete this tutorial. I made a post about it so feel free to check it out!


Uninstalling Windows 10


The first step is running the command prompt in administrator privileges.
and type in the command slmgr /dlv
You will get an information box about your computer. What we need from here is the Activation ID.



Information box about your license


After getting it we are going to uninstall that product key (so we can use it after reinstalling 8.1). Type in slmgr /upk 181520dd-3fc4-4df2-81f5c513467ad56d -I blurred out my key, so just put in yours-
If a box comes out saying your product is uninstalled. You done it right.
Go check the activation. If it says it's not activated, then you are free to move into the next step.


Windows 10 is not activated


Installing Windows 8.1


Make sure you backup all your data. And that you have your license key (That came with the disk or in an e-mail) and if you don't know where to find it. There is a helpful way to find it.


Get the Windows 8.1 disk. Boot from it by hitting F12 on boot.

Follow the installation procedure, format the drive Windows 10 is on and install Windows 8.1 there.

Make sure you are connected to the Internet when prompted.

Complete the installation as you would do normally. And when it comes to entering the key. Skip that step.


Activating Windows 8.1


When Windows 8.1 is up and running, run the command prompt in administrator privileges and type in the command slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
 Where XXXXX is your serial number, which you will find on the label of the disk or in the e-mail sent to you.
You will get a box saying key XXXXX-XXXXX-XXXXX-XXXXX-XXXXX installed successfully. 
When checking the Windows activation, I found that the key used to activate was the same I had before upgrading to Windows 10. (I blurred mine for obvious reasons).


Windows 8.1 activation


Important Notes


If you use a different version of Windows other than you used, it won't activate and you would have to reinstall Windows 8.1.

You must be online the whole time.

If you are dual-booting, you will have to do these steps again to make sure everything works.

If you are unable to find your license key use the software in this post

Update: This part is written after rolling back.
I was forced to download all of the updates released for Windows 8.1. A total of 1.5 GB download on top of the 3 gigabyte download!

I hope you found this a useful post. Please comment below if anything. And if you are out there. Don't upgrade to Windows 10.

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