The latest version of the quests can be found at:
http://code.google.com/p/projecteqqu...ource/checkout
You will need an svn client to checkout the repository.
TortoiseSVN is a good choice if you're using Windows.
The server may not have the check_handin plugin. Make sure that check_handin.pl is in your quests/plugins folder.
The svn repo does contain this file, so it would be best to checkout the latest revision.
If you decide to use TortoiseSVN then make a folder called quests and checkout on this link:
http://projecteqquests.googlecode.com/svn/trunk/