On the right hand side of the window, where it lists the files on the disk, click under the list, hold down the left button and move the cursor up to the top of the list. This should highlight all the files. Then right click somewhere in the middle of these highlighted files. This should give you a small pop-up of options…hit Extract Objects.
It will ask where on the hard drive you want the files, so set a target and it should copy them.