This hotfix has been discontinued. Instead, you can upgrade to Windows 10 and get the most up-to-date security and other features built right in. To get Windows 10, see Windows 10 Home. Need more info on Windows 10? See Upgrade to Windows 10: FAQ.
You can find more information on how to upgrade to the latest update here:
Windows 7 and Windows Server 2008 Updates
Windows 8 and Windows Server 2012 Updates