This would likely be VST 3.5 (Windows) which I believe can be opened by VST3,4 or 5 for Mac which you might find on the Steinberg FTP Server ftp://ftp.steinberg.net/Archives/Cubase_VST/Mac/
Whether this can be installed on a newer mac with newer OS I have no idea. Perhaps someone more Knowledgeable in this regard will pop in with some advice, otherwise you’ll just have to experiment (or perhaps borrow an older PC on which VST 3.5 or 5 will run). Another issue to be considered is whether the eLcc Dongle will indeed allow these older versions to be run unless you have access to an older Dongle which back then was I believe attached to the printer port.