I bought Cocktail way back, like many others, it was sold with a lifetime update warranty. Liars! They launched a Mojave Edition & you cannot update cocktail. You need to go back to running High Sierra. You have to buy a new licence to use it with Mojave. They get around this con by allowing the High Sierra edition to run but ONLY if you are running High Sierra which no one does. Why would you not upgrade your OSX? To run an old version of Cocktail? I don't think so. So be warned new editions mean another licence.