I am sorry you cannot get Connect to send courses to your device using Garmin Express. We really need more information from you to troubleshoot this. Please provide the following:
What Operating System (OS) is on your computer?
Do you get any error messages when you send the courses?
Are these courses created from a file (like a track) or in another way?
Who is your Internet Service Provider (ISP)?
Is this internet connection cable, satellite, DSL, or something else?
Are you connecting to your internet using a wireless (WiFi) or wired (Ethernet) connection?
The more information we have about your issue, the faster we can help fix it.
