I have successfully installed Windows 8.1 via the Windows store on my laptop. I had Windows 8 installed and it didn't appease me fully especially on my laptop. Windows 8.1 will ease any qualms people had with Windows8. Windows 8.1 feels like Windows 8 done right for both desktop users and tablet users.
Windows 8.1 first is downloaded via the Windows Store then it installs like a ordinary Windows installation. Windows 8.1 installed on my laptop successfully and all my programs work.
If you are using Windows 8, you can download Windows 8.1 for free at www.microsoft.com. The full Windows 8.1 upgrade can also be purchased.
The modern interface is much more matured with some very nice new features. You can customize tile size, categorize tiles etc. Instead of having to right click to view all apps, there is a down button. When you right click using a mouse now, a customize option appears. There are many nice apps like calculator, alarm, food and drink, alarms and much more. You can set your desktop background as the start screen which is a plus. The tiles are also more colorful than in Windows 8, and have various colors than one uniformed color. There are a lot more customization features for the start screen. A lot of PC settings are moved into the modern PC settings such as resolutions settings. Resolution settings are also on the desktop as well.
Windows 8.1 will make those who are unhappy with Windows 8, very happy. Microsoft has added the beloved start button which is very nice to have on both tablets and desktops. The libraries in file explorer has been change to now being called "folders. The my videos, my pictures, etc are now in My Computer, now called This PC. SkyDrive is now integrated in File Explorer and your documents are now saved to it and more. In taskbar settings and in the navigation settings, you can now choose to boot to desktop, use the desktop background in the start screen, show all apps when pressing the start button, and list desktop apps in the apps view "when its sorted by category". Also, in the navigation settings in taskbar properties, you can disable the charms bar and hot corners which is a plus for those who dislike it. Everything else appears to be the same, except for things I described here.
I strongly recommend anyone who has Windows 8 to get Windows 8.1 (its free after all). Windows 7 users should also consider upgrading to Windows 8.1. Windows 8.1 is a considerable improvement over Windows 8 and will make those unhappy or who are avoiding Windows 8, reconsider Windows 8 and upgrade to it.