Make sure your antivirus software is up to date before doing so. Things that you should do before installing the operating system update: Users who work with multiple computers may consider downloading the service pack update from Microsoft Download for distribution purposes.
Check the disk space requirements chapter to find out why it is indeed better to use Windows Update to install the service pack.
Microsoft employee Brandon LeBlanc recommends that single PC or home PC users should be 'Windows Update instead of downloading the standalone installer (or Network Installation Package) from the Microsoft Download Center' because of the better 'installation experience'.
Microsoft will make it available via Windows Update and the Microsoft Download Center. The service pack will be released on February 22 to the public.