I don’t have a folder in AppData. I’ve only ever used local Blender versions with their own config folders.
I did however delete the entire Blender 2.8 folder and replace it with a fresh build. Granted I don’t have duplicates any more but now Blender 2.8 throws me an error when I try to open the light user preferences.
Traceback (most recent call last):
File "D:\Programs\Blender\Blender 2.8a2\2.80\scripts\startup\bl_operators\wm.py", line 2515, in execute
File "D:\Programs\Blender\Blender 2.8a2\2.80\scripts\modules\bpy\ops.py", line 198, in __call__
ret = op_call(self.idname_py(), C_dict, kw, C_exec, C_undo)
AttributeError: Calling operator "bpy.ops.screen.userpref_show" error, could not be found
location: <unknown location>:-1