I'm just a fellow simmer from the UK (not from Laminar Research)
It's very difficult trying to establish why your PC went CTD when it was trying to load X-Plane 11, it could be any number of reasons, software or hardware?
However, if it is of some help, I have prepared a number of PowerPoint slides (please click on following link) which tries to explain how to upload a file within the X-Plane Q&A forum.
Any problems, please let me know?
PS Please note also that you have sent your query to X-Plane's Q&A forum, not X-Plane's bug reporting site!