With each periodic Overcast Server release and upgrade, a new version of the Secure Agent is released, but not every new Secure Agent release contains a functional change from a previous release.
The Secure Agent is a Microsoft Installer package (MSI) and supports in-place upgrades.
If you are experiencing an issue with your current version and have been recommended to upgrade, you can obtain the latest release from the Overcast for Salesforce App, in the Settings tab, by selecting the Install Secure Agent button.
Problem: When running as an administrator, the installer says that you do not have permission to install the service.
Cause: Sometimes the complete removal of a Windows Service fails or gets stuck and the Service remains.
Solution: Manually delete the service, and then reinstall.
sc delete <service name>