How to Activate Windows 8 Developer Preview Build 8102 M3

Microsoft tried to make the installation process of windows 8 developer preview as easy as possible. Users don't need to type any product key during installation. And it's working fine after installing. 

However if someone finds that he needs to provide a product for activation then he can try this one: 6RH4V-HNTWC-JQKG8-RFR3R-36498

There is another method to activate windows 8 developer preview. Just follow the steps below:
  1. Press Start button and Type cmd
  2. Now Command Prompt window will appear and need to type the following code
slmgr.vbs -ipk 6RH4V-HNTWC-JQKG8-RFR3R-36498
slmgr.vbs -ato
Note: After typing the first line and when you press enter there may appear several windows with error messages. Don't be panic. You will get the activation message within 1/2 minutes.

If this system does not work for you then follow this method.

Now Press Window Logo Key + Pause. Your computer properties will show windows is activated. And click on the View details. It will show a window with activation status like below:

Note: If the above system doesn't work for you then you can Activate Windows Developer Preview Build 8102 M3 by Windows Update. It is 100% working method and provided by Microsoft itself!

And if all the above system fails, then you need to download the consumer preview copy of Windows 8. 

Click here to Activate the Final Version of Windows 8 (Build 9200)