Microsoft announced on Thursday, 17 October 2013, that Windows 8.1 is now available for download from the Windows Store.
Microsoft also announced that the limited support period for Windows 8 will end on 18 October 2015. Microsoft stresses that this is for security and stability reasons.
Windows 8 users are able to download the update to Windows 8.1 through the Windows Store for free, Microsoft said.
Users on Windows 7 can buy the upgrade to Windows 8.1 for $119.99 through Microsoft’s online store from Friday, 18 October 2013.
Microsoft also announced that a packaged DVD product will go on sale at retail locations around the world on Friday.
According to the Microsoft store page, Windows 8.1 is “not designed for installation on devices running Windows XP or Windows Vista”.
Those running older versions of Windows will first have to upgrade to Windows 8, after which they can upgrade to Windows 8.1 for free, Microsoft said.