No, GUI Plugs the USB into the USB port on the side of the H, Look for it, it's there. And yes the new firmware is out! Go to Yuneec.com, Support then click on the H , Ooops . sorry hate this forum as it does not separate the models, see you have a Q500, not sure, but the H has a new one!
The USB Adapter you need to connect the GUI with the Q should have come with the purchase of the drone.
A new one can be found on the web. Look here:
Yuneec USA USB Interface/Programmer: Q500, YUNA100 | eBay
Your McAfee anti virus is giving you a "False-Positive hit" on the GUI.Tell it to make an exception for that program when scanning and you'll be fine. Of course... that's assuming you downloaded the program from the Yuneec site.
Good luck and happy flying,