Use the USB-Cable to plug in the back of the drone, then connect it to your computer. Switch on remote control of the drone, and put it aside, then switch on the drone. Your filefinder on the computer will show the internal memory of the drone as an external drive of the computer. Look for the file (ends with .mp4 or .mov) and just move it over to your computer.
That is the way I get my footage from the drone (as well as from the SD-Card) to the computer.
The reason you have to switch on the control is (that is atleast what i was told) that if the drone cannot get a connection to the controler, it might want to try to return to the last point it registered as "take off point". Something you don't really want to happen inside the house