ghdlkk It keeps in the Pending... state.
I get that when my Google Play Store settings are set to only download using wifi. Are you trying to download an app while using your mobile connection? Also, I have changed my settings to allow mobile downloads, but some downloads still don't work for some reason.
ghdlkk Do I have to grant the Play Store persimmsions to install apps? If yes, how can I do this?
It should prompt you if it doesn't have access, but you can enable installing apps here:
Settings > Apps > Sandboxed Google Play > Play Store app info > Install unknown apps. I usually turn both options on, but you must turn on "Allow from this source".