Contact Payment Page support or email support@gauchoplugins.com to ask whether a beta is currently available for your license and site.
The previous screenshots and account-menu steps on this page were tied to an older Freemius interface and can no longer be verified. Payment Page 1.5.3 does not expose those beta-enrollment controls in its wp-admin screens, and the separate Freemius account interface can change independently. For that reason, this page does not publish a fixed screenshot or promise a self-service opt-in sequence.
Do not install a beta on a live site without a current backup and a rollback plan.