Use the following steps to upgrade your SecureAuth IdP RADIUS server to v19.09.
1. Back up the appliance.radius.properties file.
2. Install SecureAuth IdP RADIUS server v19.09 in a new folder, separate from earlier versions of RADIUS.
3. Validate RADIUS v19.09 installed successfully.
4. If upgrading from RADIUS v1.0.x, disable the RADIUS v1.0.x Windows service "SecureAuthRadiusService2" in the Windows Services console (services.msc).