When you're on the object selection in scendario editor, there is a button on the top right of the obeject select box that says filter. When you click filter all of the versions of the game will show up
I recently downloaded the files on here for my mac to run openrct2. It has the expansion scenarios and when I click on (say the Dark Age scenario) it has the dark age theming. In my scenario editor I dont have the dark age theming or any of the other expansion themes. How do I get them?