Editing downloaded scenario

Early adopter but I've been away a really long time. I downloaded a scenario (mainly because I wanted the terrain) but I don't see a way to edit the scenario rules. If I access it, it only gives me the option to play the scenario, not to edit it. Is there a way to download a scenario and just use the map from it?
 
You have to open it first in game. Save it as a park. Then the option of editing the scenario should be available.
 
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