If you're running CRON, please ensure it is running every minute and that the command is correct, including your PHP path. If you have any doubts, please copy the command from ACP -> System -> Advanced Configuration.
Otherwise, please check to see if there are any errors in your System Log. If there are, we can take a look.
We would need to look further into this for you, however the access details on file appear to be incorrect or missing. Could you please update these details by visiting your client area, selecting the relevant purchase, then clicking "Review/Update Access Information" under the "Stored Access Information" section.
We look forward to further assisting you.