If you use the eight, then you can switch to Windows 8.1 using the Windows store for free. But other users already need to purchase a license, meaning those who have Vista for example. At the development stage it was announced that users will be able to use the 8.0 key to install 8.1. However, this rule after the official release does not work. If you enter the 8key key when installing 8.1 then your system will not accept it and give an error.
In my opinion, this is done so that the majority of users switch to 8.1 by updating the system, rather than performing a clean installation again. The method of updating through the store, in my opinion, is not the most convenient. The best and legitimate is installing Windows 8.1 using a shared product key and further activating with a genuine Windows 8.0 key. What is a shared product key? This is like a dummy key, it will help to install the operating system, but can not be used to activate it. These shared keys are legal and can be found on the Microsoft website at: technet.microsoft.com/en-us/library/jj612867.aspx or use the ones I specified below:
- Core/Home = 334NH-RXG76-64THK-C7CKG-D3VPT
- Core/Home N = 6NPQ8-PK64X-W4WMM-MF84V-RGB89
- Core/Home Single Language = Y9NXP-XT8MV-PT9TG-97CT3-9D6TC
- Professional = XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB
- Professional N=JRBBN-4Q997-H4RM2-H3B7W-Q68KC
- Professional with Media Centre = GBFNG-2X3TC-8R27F-RMKYB-JK7QT
- Enterprise = MHF9N-XY6XB-WVXMC-BTDCT-MKKG7
- Enterprise N = TT4HM-HN7YT-62K67-RGRQJ-JFFXW
Installing Windows 8.1 in pictures:
We now activate the system through the properties of the computer. Enter the product key, which did not work during the installation of the system, the activation should work fine. By the way, if you have for example the original key from OEM version 8.0, then you can not activate the 8.1 Windows Professional installed.