Get it from the svn repo at:
http://projecteqdb.googlecode.com/svn/trunk/peqdatabase
Read this page as well:
http://www.peqtgc.com/phpBB2/viewtopic.php?t=7112
Hope this gets you going. be advised that after you install 1667, IF YOUR SOURCE HAS NEWER SQL UPDATES, then you will need to apply those as well...
This means if you pulled source that is after 1667, then you will need to apply that sql. There are two optional sql's in there as well...Check in your source/utils/sql folder to see if you have these sql's..Remember as well, if you pull new source, and PEQ has not updated, you will need to manually apply any possible new sql's..
Good luck, hopefully this will set you on the right path...