PokerTracker

Just started to play omaha and wonder why my omaha sm stakes expired.

I've checked your account and you don't own a PokerTracker 4 Omaha Small Stakes license. Why do you think you have an PokerTracker 4 Omaha license that is expired? Purchased licenses do not expire although when you registered PokerTracker 4 Holdem you automatically receive a free 10 day trial for Omaha which you can access via the 'Help -> Register' menu item and then selecting the 'Begin 10 Day Omaha Trial' button so if that's expired then this means you have already used the Omaha trial.