I've just gone through the error log from the past few weeks and fixed up a couple of bugs (was freaking out on classes that weren't most weeks and a few other small things), so if this didn't work for you, give it another go.
just go to myUNSW and find your timetable. Save the page (command S on a Mac, control S on Windows) as "page source" or "HTML" or something similar, you should end up with a .html file, upload that to the converter.
Thanks for letting me know! Google Calendar can be a little bit picky when it comes to importing. I think I've fixed this, if you download a new calendar file it should work now.
I made a thing that I think people here might find useful. Upload your UNSW timetable and it’ll convert it into a .ics file for Apple Calendar, Outlook, Google/Yahoo Calendar, your phone, etc.
Give it a go and let me know how it goes…
http://calendariser.fredgreer.com