Current users of WordPress Mail Queue with an active support and upgrade subscription via Freemius can upgrade via the Plugins page within their blog dashboard.
Version 4.3 contains the following enhancements and bug fixes:
- Update to latest release of the Freemius SDK
- Update wp_mail() functions ready for WordPress 5.6 including fixes for #25239 and #50720
- Improve i18n support with specified domain path and location of language files
- WordPress 5.6 ready