No idea friend, it might be old info or you need to be at another interface somewhere.

Everyone else on the planet does what you want to do this way:

You log in at AutoCAD360 here in your webbrowser (I recommend Chrome) https://client.autocad360.com/#/filemanager.html

Create a folder if you want

Upload your file to that webpage

Open your file in that webpage

Print your file (click on the print icon), select DWF instead of the default PDF, and choose your page size, scale etc.

The DWF is created for you.

Follow any and all prompts as they come up to get your DWF.