If you were one of the people who had Windows 8 up and running before the release to the general public, and installed Fruit Ninja when it was free, you might be running into an issue now where the store tell you that it needs an update, but it just throws an error every time you try and actually install the update. Here’s what I was able to do to fix that. First, open a PowerShell prompt as administrator and run this:
Get-AppxPackage HalfbrickStudiosPtyLtd.FruitNinja | Remove-AppxPackage
That will uninstall the app. For me, doing the uninstall from the Start screen didn’t actually remove it. Once you have done that, then run:
which will reset your Windows Store cache. Once that’s done, you should be able to go back to your list of apps and successfully install the newest version.