I am running Windows 10 Pro and had the same problem. I updated " your software is up to date", tried again to transmit returns "you need an update". Finally, I saved my returns to PDF just in case and uninstalled the software. I then reinstalled the software and updated the software. My return was still there so I hit "transmit" and the returns were sent with no problem. I have no idea what caused the problem, but this worked for me.
