You have the latest beta. You do not have the latest canary (which is bleeding-edge but people who are willing to use it for non-critical backups and to help report problems that are found are very helpful for the next beta).
A chronological view of releases, along with the actual download locations, is here in GitHub. Canary can add nice features (sometimes having bugs), known bug fixes, and unknown issues (sometimes rather severe…).
Settings in Duplicati explains how you can adjust the update systen. You can probably either set Canary, and update the beta when it finds one (updates go to a different directory and are detected at startup), or uninstall the beta and install canary as a fresh install. Uninstalling Duplicati should keep your old backup configuration.