I was divorced April 2010, and support order states that ex is to update annually. He has never done so. Can this be done without lawyer and court?

It is a statutory requirement in the state of Wisconsin that if there is a  child support or family support order, that there must be an annual exchange of income tax information to verify incomes. If your ex spouse is refusing to comply, you can on your own, or with a lawyer, file a motion to find your ex spouse in contempt of court for failing to produce, and if their income reveals an increase was in order, seek the increase in support. You are well advised to send a letter first by certified mail that demands that they provide you the returns within 30 days; if they fail to comply, file your motion.