If you happen to close the browser tab during that session, you will not be able to download the converted DWG file. You can download the converted file directly from this page, during one session. This process is performed automatically - humans don’t have access to the user files and the content within them. All uploaded PDF files are immediately sent to servers for conversion and then removed from the servers without a trace shortly after conversion.
This PDF converter to AutoCAD is an online tool and requires internet connection.