Windows 8.1 Update 1 is now available to download
Windows 8.1 update 1 (also known as KB 2919355) has been made available to download for free through the Windows update feature and the Microsoft’s download section.
If you are planning to install the update by downloading the files through Microsoft’s website make sure that you have the KB 2919442 patch already installed as it is required in order to install the new update.
On other other hand, if you are installing the patch through the Windows update feature there is a high chance that you have already installed the patch by now.
The update is designed to improve the Windows interface as well as the functionality for keyboard and mouse users. For more detailed information visit Exploring Windows 8.1 Update.