I have been contacted by one of our kind users who has let us know that the links for the past paper treasure trove have changed.
You will now find them at;
Year 12: http://thsconline.github.io/s/yr12/Maths
Year 11: http://thsconline.github.io/s/yr11/Maths
Year 10: http://thsconline.github.io/s/yr10/Maths
You will find links to other subjects as well, it has a huge array of papers
If you can help build this resource, there is an upload button where you can upload any papers you may have that are not already in the database, so do the right thing and share what you have just as this site is sharing with you for free.
Many thanks to thsconline, for sharing this site with us.