From now on, a free upgrade of Windows 8 to Windows 8.1 is available for licensed users.
The 3.7 GB update is downloaded and installed via the Windows Store.

If there is no update in the store, then it may be necessary to install the patch KB2871389 through the update center. If the patch is already installed, it is reported that restarting the computer helps.
After downloading and compatibility checking you will be asked to reboot.

Then log into your account

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and finally you can work!
The Verge wrote a review of Windows 8.1 - set 8.8 points. Improvements
are described in detail .
Microsoft website with
instructions .
News plus: final versions of
Visual Studio 2013 and TFS 2013 have been released today.