I think was AaronD was trying to tell you is to ask the question in the plugin's forum thread, as you are much more likely to get a reply there.
But to answer your question:
The settings of the advanced scene switcher plugin are stored as part of the scene collection.
So if you are using a standard (non-portable) installation of OBS the data should be in this directory:
C:\Users\<your user name here>\AppData\Roaming\obs-studio\basic\scenes