Can't get unattended access with Pro Hi Lisa,
You need to make sure that you allowed unattended access on the computers with Connect Free that you want to Connect TO:
Once it's done, you should see the option to "Connect using Windows logon credentials" when you try connecting from your computer with Connect Pro to a computer with an open session (and there you can input Windows credentials of the current user to enter this open session without any help from the other side):
Or you will go straight to the Windows logon screen if there are no open sessions on the remote computer:
This how unattended access works in Connect Pro. Though if you need "unattended" connections to open sessions on remote computers without providing Windows credentials, then you would have to use the Connect Managed product where this option is available.