The easiest way to remove manually the agent on macOS is by deleting its files and folder.
Go to (hard drive)/Library. You will find a DWAgent folder. Just delete it
Then delete the files below :
(Hard Drive)/Library/LaunchAgents/net.dwservice.agguilnc.plist
(Hard Drive)/Library/LaunchAgents/net.dwservice.agsystray.plist
(Hard Drive)/Library/LaunchDaemons/net.dwservice.agsvc.plist
Finally restart the Mac