On PC, you can if you:
1. Delete the 'saves' subfolder of Ravager.
2. Go to C:\Users\[USERNAME]\AppData\Roaming\Renpy, and delete the folder whose name starts with Ravager.
I'm still getting the saves and preferences showing up if I delete the save folder under the ravagar file. I have even tried to delete the entire ravager file and download a new one, so there is no file on my computer, and that still doesn't work. For the other option, I can't find the file when looking through my folders. Is there a specific sub folder to search under to find it?
Edit: I managed to get it by using the AppData application, but it was difficult to find.