Windows 8.1 will be released as a free update later this year for Windows 8 users, but those who want to try the 8.1 Preview can do so now by visiting this link. There, you'll be prompted to install an update to Windows 8, after which the 8.1 Preview will appear as a download in the Windows Store. Full ISO files will be online within 24 hours. The 2GB install adds features like a Start Button for the Desktop (which takes you to the Start Screen), a Boot to Desktop option, updated Search Tool, deep integration with SkyDrive, and many other updates. We'll be testing and demoing Windows 8.1 soon, after we get it installed on one of our testbeds.