You do not need to look in the subfolders, if you have enabled logging it will be in the main user data folder that I gave you the path for. (In the same folder that you see the Config, Data and Logs folders.)
If you don't have the PokerTracker4.log file there that suggests you haven't run with logging enabled.
Click Start then click All Programs, then PokerTracker 4 and then the "Logging Enabled" logging.