Use the automatic update feature of Windows to get critical updates before moving towards free upgrade to Windows 8.1.

Use reliable internet connection for Windows 8.1 free upgrade.

Keep your device powered throughout the process.

You should have sufficient disk space for installing updates: 3.85GB for 64 bit and 3GB for 32 bit version of Windows 8.1.

Backup your files by setting up File History.

You should do the following things before installing update for Windows 8.1. The update time depends on factors like internet connection and system specifications.

You can use your PC while the update is being installed in the background.

If you have a Microsoft account for logging into your Windows 8, the same will work for Windows 8.1.

It will let you know what you need to do about these apps for getting them ready for updates.

Microsoft will check your current desktop apps and other connected devices.

Your existing Windows store apps will have to be re-downloaded once the update is completed. Windows 8.1 carries some new apps, and it will update or replace some of your existing built-in apps.

Your desktop apps, files, user accounts, and settings come with you.

Before you update your Windows, keep in mind the following things. The system requirements for running Windows 8.1 are nearly the same as those for Windows 8.

Windows 8.1 free upgrade is available from Windows store. If you are currently using Windows 8, you can get updates for Windows 8.1 for absolutely free of cost. It is quite fast as observed on a variety of devices, especially on the new generation of the touch devices.

It carries the security and reliability features that you expect from Windows. Windows update 8.1, also called as Windows blue, brings enhancements in your search, personalization, the Windows store, apps and the cloud connectivity. How to Upgrade Windows 8.0 to Windows 8.1 – Screenshots