Windows 8.1 operating system is an update version of the Windows 8 operating system. First unveiled and released as a public beta in June 2013, Windows 8.1 was released to manufacturing on August 27, 2013, and hit general availability on October 17, 2013 almost a year since the original, retail release of 8. 8.1 is available as a free update for existing Windows 8 and Windows RT users via Windows Store, but unlike the service packs of previous versions of Windows, it is not distributed through Windows Update, and users who obtained 8 outside of retail copies or pre loaded installations (i.e. volume licensing) must obtain 8.1 through new installation media from their respective subscription or enterprise channel. As with previous service packs, installation of 8.1 will be required to maintain access to Windows 8's mainstream support after January 12, 2016, per Microsoft's software life cycle policies.
How To Use Windows 8.1 Wat remover or Activator.
1. Extract the downloaded file to somewhere.
2. Now run '.exe' file as administrator and install the software.
3. You will find the shortcut at the 'desktop'.
4. Run it as 'administrator'.
5. Click on 'Clean activation History' and wait for some time.
6. Click on 'Update Server'.
7. Now select your windows 8.1 version and click on 'Activate Now'.
8. Now you will get a message saying 'Windows is activated'.