There was previously an issue in the Auto-Update feature where it failed to find a registry key if the user had selected the 'Just Me' option instead of the 'All Users' option in original installation.
This issue was fixed in v19.0.9.
To manually update the product, please simply download the latest version from our web site. This will automatically uninstall any previously installed version.
If you still have an issue, please see Knowledge Base Article: