In Windows, go to Control Panel/Programs/Uninstall a program.
In macOS, you'll need to manually remove these folders and files in the Finder: "Unique" incl. NKS is used here, you can substitute the productname. Open the Finder, click "Go To" in the menu, open "Go To Folder" and paste the paths to locate.
/Applications/Sugar Bytes/Unique
/Library/Audio/Plug-Ins/VST/Unique.vst
/Library/Audio/Plug-Ins/Components/Unique.component
/Library/Application Support/Avid/Audio/Plug-Ins/Unique.aaxplugin
~/Documents/Sugar Bytes/Unique
~/Library/Preferences/com.sugar-bytes.Unique.plist
NKS (Native Kontrol Standard):
/Library/Application Support/Sugar Bytes/Unique
/Library/Application Support/Native Instruments/Service Center/Unique.xml
/Library/Preferences/com.native-instruments.Unique.plist