Release notes for WHMCS 8.5.
Release notes for WHMCS 8.6.
Release notes for WHMCS 8.7.
Everything in WHMCS 8.8, including new features, updates, improvements, deprecations, removals, and theme and template changes.
Everything in WHMCS 8.9, including new features, updates, improvements, deprecations, removals, and theme and template changes.