frmax wrote on 5/19/2020, 5:20 PM

Go to Options -> Preferences , select Tab VST Effects .

For Alternate VST folder 1 press Browse and e.g. select C:\Program Files\Steinberg\VstPlugins\Accusonus\ (or wherever you have installed) then Button Refresh

You will find ERA 4 De-Esser in the Fx-List for Audio-plugins. Be sure to install VST2 Version, VST3 doesn´t work in Vegas 17 (without tricks..)