Nova's internal HTTP/FTP download function, activated from the Main Menu, uses your Internet connection to download new Keplerian elements from the internet.  After downloading, it automatically updates Nova for Windows' internal database.   The entire operation can be done with one mouse click.

From the Main Menu, select Kep. Elements, then Internet update, then Start download.  The rest is automatic.  You must have an internet connection, of course.

Select the file(s) to download by choosing Configure Internet download from the Main Menu, then clicking on the Remote files button...

The file list is shown in the drop-down list: