My site was working okay, with the courses being released after the paypal payment, but now this is not happening. The product stays there waiting for a long time. The courses are being sold as downloadable products, and the Paypal keys, the APIs, are all ok, as before, but there is no automatic course release.
WPLMS only checks if the woocommerce order status is completed or not, if the woocommerce order is completed then the course access is given to the user.
So please make sure your woocommerce order is completed to get the access.