1. Back Up Your PC
Similar to downloading iOS 7, PC owners should make sure they back up all their work before attempting this download. Although this is an official download, you still can run the risk of damaging your computer. Store your work on a thumb drive just to be safe.
2. Check To See If You Are Running Windows 8
The entire process could be done quickly if you already have Windows 8 on your PC. Fortunately, this gives you a free download of the software instead of paying a fee. However, you can upgrade Windows 8.1 from Windows 7 devices.
3. Read The System Requirements
This is another important factor that you can't overlook. If your PC misses any of these requirements, the download will render your device useless. Below is a brief overview of what your computer needs to have in order for this work.
-1 GHz processor or faster with support for PAE, NX, and SSE2
-1-2 GB RAM / 16-20 GB available hard disk space
-Watching DVDs requires separate playback software
-DirectX 9 graphics processor with WDDM driver
There is a more in-depth run down available on the Windows Store site.
Follow these steps and Windows 8.1 will be running on your PC in no time. The price for the software varies between the standard version and Windows 8.1 Pro but the download is worth it especially if you miss the start button at the bottom of the page. Check out the best features and reviews in the articles below!