you want to find DivX you say??
Well, first things first, DivX is a type of compression format to make movies small enough to fit on your memory card in your phone.
You need DivX Player for Symbian S60 3rd Edition phones - http://labs.divx.com/node/6211 - (you may need to sign up). Install this on your phone.
Then you need to find a website that offers DivX movies, like piratebay.org OR you can compress your own DivX movies using software like Smartmovie, its a lengthy process compressing a movie, it can take around 1hr20mins. www.google.co.uk is your best friend!
p.s. i've been using DivX for years & years but watching a movie on your phone does not do ANY movies ANY justice! (just my opinion!)