This text window will report all messages (Log) from the program and drivers.
If configured, the messages (log) will be also stored in a text log file for further study. It essential to use this option if you let the program run unattended.
The file location is:
/home/[your user name]/.config/ccdciel/Log
C:\Users\[your user name]\AppData\Local\ccdciel\log
Note that above folders are typically hidden.
The Help menu provide a quick access to this folder and the current log file.