There are many Windows 8 and RT users who want to upgrade to Windows 8.1 and RT 8.1, but can't; a glitch has kept a seemingly random batch of PCs from installing this latest revision through the Windows Store. Thankfully, relief is in sight. Microsoft tells SuperSite for Windows that it's testing a patch which automatically upgrades these stubborn computers to their respective 8.1 releases. If you're eligible, you only need to check Windows Update (not the Store) to get the ball rolling. Windows RT users, at least, can also download the solution if they're impatient. Microsoft isn't saying if and when the fix will spread worldwide, but it likely can't come soon enough if you're stuck with outdated software.
Microsoft Windows 8.1
Microsoft Windows RT