How to update to windows 8.1: Easy way to upgrade your windows 8 to window 8.1

 Here are the step you need to take in other to upgrade your windows8 to windows8.1

1. Prepare your PC

There are a few things you should do before you start installing.

1.     Back up your files.
2.     Make sure you have enough free disk space.   
3.  Plug in your laptop or tablet.   
4.  Connect to the Internet. It's best to stay connected until the update is done. If you don't, you’ll need to connect again to finish setting up later, and setup will take longer.   
5.  Get the latest critical and important updates. There are some updates you might need before you can install Windows 8.1. In most cases, the latest updates will be installed automatically using Windows Update.  
6. Temporarily turn off your antivirus program. Some antivirus software might interfere with the installation. After you install Windows 8.1 or Windows RT 8.1, remember to turn your antivirus program back on.

Get the free update

    Now you can download the free update from the Windows Store.

1. Go to the Start screen, and tap or click the Store tile.
   In the Store, tap or click the Windows 8.1 or Windows RT 8.1 update. if you don't see the update on the Store home screen, see Why can't I find the update in the Store?
   
   2Tap or click Download.
   
   The update will download and install in the background while you use your PC to do other things. The installer will check to make sure you have enough disk space, that your apps and devices will work with Windows 8.1 or Windows RT 8.1, and that you have all the required updates. 

    Restart

After the update is downloaded and the first phase of the installation is complete (which could take between 15 minutes and a few hours, depending on your system and your connection speed), you'll see a message telling you that your PC needs to restart. It will give you 15 minutes to finish what you’re working on, save your work, and close your apps, and then it will restart your PC for you. Or you can restart it yourself.

Choose your settings
After your PC finishes restarting, you'll be presented with the Microsoft software license terms. Review the terms, and then tap or click I accept to continue. If you don't accept the terms, this cancels the installation of Windows 8.1 or Windows RT 8.1, and your PC will roll back to Windows 8 or Windows RT.

Welcome to the new Windows

The new Start screen will appear.

With this illustration, I hope that it helps you on how to update from windows8 to windows8.1.