FLStudio Groove App in the Windows Store has not automatically updated, you can manually do so as follows:
1. Go to the Windows Store.
2. Click on ‘ Account ’ (top of the screen)
3. Click on ‘ My apps ...
You can find the FLStudio Groove app here in the Windows App Store . If no results are shown when clicking the above link, please try to update to Windows version 8.1 first. ...