If there is a later version of Ryzen Master to the one you have installed, on the right hand side of the title bar, you will see a download button indicating a later version is available. Click it to navigate to the Settings > General page. Under Update, you can view the current version installed. The latest version available along with a Download button against it is also displayed. Click Download to download and launch the Upgrade wizard. Accept the messages and follow prompts to upgrade to the latest version.
You can also download the latest installer from AMD website, and run the .exe file. If you have an existing version of Ryzen Master installed, the installer wizard is launched. Follow on-screen prompts to complete upgrading to the latest Ryzen Master version.
If Ryzen Master fails to uninstall or upgrade properly when a new version is being installed, use the Microsoft install/uninstall troubleshooter to clean up the Ryzen Master elements and ensure a clean installation. See Microsoft application installation troubleshooter for additional information.
Alternatively, you can use the AMD Cleanup Utility.