How can I open DWF files in Bentley View Connect ? (update 15)

I have an internal client, exchanging files with a bureau that distributes its files in DWF-format. I can see them via online viewers, like https://sharecad.org/ and https://viewer.autodesk.com/

I get an error, loading them into Bentley View (up15)

What do I do to read, maybe convert those files, short of installing AutoCAD?