I am not with Laminar Research; just a flight simmer.
With the dvd disc set you have to have disc 1 in an active drive at all times. There is no password key and USB dongle as was the case with XP10.
If x-plane is installed correctly by you the best method is to install X-Plane on another PC with DVD drives and then copy via suitable capacity USB drive onto your new computer. Then purchase a portable DVD drive with a USB connection and connect to your new computer to enable disc 1 to be installed/engaged at all times.
Alternatively if you know someone who can create an ISO disc/USB dongle for disc 1 then create your own dongle as the substitute for disc 1.
Disc 1 will not direct copy onto a USB drive as there are hidden files.