The old password generator has been replaced in Kee 3.6, which will be available for beta testing soon, so install the current beta version if you haven’t already.
I’ve added the new password generator to another place too so you will also be able to get to it by using the new feature in the main Kee popup menu.
Also note that the default keyboard shortcut will change to Alt+Shift+G. That’s explained in the updated documentation.