The main log file (TVRename.log) can be found in: -
Log files are rotated into an “archive” folder (in the same location as TVRename.log) every time TV Rename is run or every 24 hours, whichever is sooner.
As with tvdb.json and settings.json a maximum of ten backup copies of the log file are kept (TVRename00.log - TVRename09.log) on a first-in-first-out (FIFO) basis.
Logging uses NLog. The configuration file (NLog.config) is stored in the TV Rename program folder.
You can read the NLog Wiki for guidance on how to adjust the configuration file to collect more information.
When raising a bug please include a log file that illustrates the issue if you can, it will help us find a solution quickly.