If you have 2.0.8 it's the most current, so that's not the problem. The only other issues I would consider:
1. Make sure Assistant 2 is up and running and you have the screen with a showing an icon with a computer and the USB unconnected to the right. If it's to the right Assistant 2 is ready for connection.
2. Plug in the USB to computer then drone, then power on drone. If the USB icon on Assistant 2 doesn't move towards the computer icon, in about 20 to 30 seconds, I would try reinstalling the software.
3. I would also make sure the USB on the computer side connection is not connected to the hub but directly to a USB connection on the computer. Hopefully a USB 3 port on the computer, not a USB2 port.
If you still can't get connection, can you attempt to use a different computer? If it connects on the 2nd computer, then there must be something in your computer setup that the Assistant 2 for Mavic software is having a conflict with.
Paul C