If you haven't already try a complete uninstall of the hidden files and folders as well so give this a try:
Uninstall the Sky Go app and then go to 'C:\Users\[your user name]\AppData\Roaming (ensure hidden files/folders are visible) and delete the following folders:
Sky
Sky Go
And if it is present the Cisco and/or Synamedia folder in App\Data\LocalLow.
Empty your recycle bin.
Reboot your PC and then download and install the Sky Go app again.
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