From: https://www.ui.com/download/unifi/unifi-ap-ac-pro

5. Once a new command prompt line is presented, that means uninstalling the service was successful. Update the UniFi Network Controller application's version with any of the regular methods. Go to Settings > Maintenance in the Controller to upgrade to the latest public released version, or alternatively download the UniFi Network Controller installation package for Windows from the Downloads page or the Releases section of the Community.

From <https://help.ui.com/hc/en-us/articles/205144550-UniFi-Run-the-Controller-as-a-Windows-Service>