Tanks for the reply, unfortunately this log does not provide me any useful information. It is clear that this is the right test version. Did you send me the complete log?
Open Calibre, on the Preference button, click on the "Restart Calibre in debug mode" (keyboard shortcut Ctrl+Shit+R).
After the restart, do the operation that raise the error, after that, copy-paste the content of the text file that which has just opened.
Or use this command and send me the "calibre-debug.log" create in your user folder?
Code:
calibre-debug.exe -g > calibre-debug.log