My season switcher is in the same "Addon Scenery" folder that my "Return to Misty Moorings" folder is in. Inside my RTMM folder are all the scenery location folders with their "scenery" subfolders below them.
S:\Lockheed Martin P3Dv3 <--- (my FS scenery folder, not the P3d program folder. That's on the Q: drive.)
-Addon Scenery
- RTMM Season Switcher v3.3 <--- Season switcher folder in addon scenery folder.
- Return to Misty Moorings DX10
+ Aiken Creek Camp
+ Alaska Power Project
+ Annette Island Fly-In
+ Badger Lake Cabins ...
(these are my P3dv3 scenery folders, ... I point my P3dv4 at them)