HOW TO GET WINDOWSPHONE 8.1 UPDATE 1(GDR1) PREVIEW?

To get the update just follow the below steps:
1.First open App Studio:http://appstudio.windows.com
2.Sign in with the same Microsoft account you have used on your Windows phone
3.After that install Preview for developers app on your phone:http://www.windowsphone.com/s?appid=178ac8a1-6519-4a0b-960c-038393741e96
4.Now sign in with the same Microsoft account used in your Windows phone
5.Tick the Enable Preview for developers box and tap on Done
For Terms andConditions: http://dev.windows.com/en-us/develop/devpreview.
You have to free 150MB space for the Update.