Please help me forza motorsport 6 apex unable to launch

WHEN I CLICK ON FORZA MOTORSPORT 6 APEX IT OPEN AND SHOW FORZA MOTORSPORT 6 APEX(BETA) IS CURRENTLY NOT AVAILABLE.
AND WHEN I TRY TO UPDATE OR INSTALL IT FROM XBOX STORE IT SHOWS AN ERROR 0X803F8001. TELL ME WHAT TO DO. I HAVE UPDATED WINDOWS 10 SINGLE LANGUAGE

Are you at the Anniversary Update status, as this is definitely a requirement?

P.S. Please switch Caps Lock off!