The user interface of FreeDATA is creating a config file
~/.config/FreeDATA/config.json
~/Library/Application Support/FreeDATA/config.json
C:\Users\<username>\AppData\Roaming\FreeDATA\config.json
%USERPROFILE%\AppData\Roaming\FreeDATA\config.json
They should be provided with every bug report on Github!
~/.config/FreeDATA/logs/{process type}.log
~/Library/Logs/FreeDATA/{process type}.log
%USERPROFILE%\AppData\Roaming\FreeDATA\logs\{process type}.log