Hi Frank,
Thanks for your question. To download the whole structure, please do as follows:
1. Mark the whole structure by clicking the "all" box at the top of the list in documents.
2. Go to "Share" on the toolbar and select "Compress ans Retrieve"
3. The whole structure will be downloaded as a zip to your loval computer. You can select whether you want to include all versions of version managed documents.
Best regards,
Karolina