I'm away from the office now, but I'll look later and see if there is still a link to 3.9 on the server.
What is your reason for wanting an older version? Remember, most of the free and premium v4 modules will not work with it.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)