May I ask for you to create and test a template to download everything, all of the forum at this address:
For access, my information is:
user --- vladmir45 | pass --- how2learn
It will help to skip the logout link (no additional setting is required). Also, it improves the forum downloading templates. Please go to the Tools - Manage Templates dialog and delete the two last templates aout forums.
Quit and start Offline Explorer again to have them recreated. Then use one of the appropriate templates to create a new Project.