Follow the guide here to completely remove Sky Go and then do a reboot beforeinstalling it again from the Sky website, you can ignore the date and time bit:
https://www.sky.com/help/diagnostics/sky-go/error-pfe-desktop-app-window
Follow the guide here to completely remove Sky Go and then do a reboot beforeinstalling it again from the Sky website, you can ignore the date and time bit:
https://www.sky.com/help/diagnostics/sky-go/error-pfe-desktop-app-window