Just read and the article that with Mojave that I just upgraded two days ago, Apple, in its great wisdom, has removed the opportunity to become an old OS. (I wish I had known the week before you upgraded, I probably had all the old ones there)
I see grateful installer El Capitan, in my apps folder, just the one … but I wanted to try older: Snow Leopard to Yosemite. I think they work better with my old Dreamweaver CS3 I'm going to use in Parallels.
Any idea how to get the old OS?