You can use Upgrade option to update the UCOS.The Upgrade button becomes active if updated add-in software is available, otherwise, it remains grayed.
You can download the required UCOS III add-in from the below link:
Please follow the steps mentioned below:
It is assumed that the:
•Updated add-in software is installed.
•Target project is expanded in the Project Explorer view.
To upgrade an add-in in the system configuration of the selected project:
1. Double-click the system.svc file of the project.
The System Configuration utility appears.
2. In Installed Add-ins, select an item.
3. Click Upgrade
The Upgrade Add-in Confirmation dialog box appears.
4. Review the proposed upgrade.
5. Click Finish.
6. Configure the upgraded add-in for the project.