Greetings and welcome to the Forum.

Most of us got the recall notice starting this past September. If anything, the Saturn dealer should be able to find out the pertinent information for you. I'm sure that they can (and should) check with Saturn/GM central and find out if it was installed. The only issues that may arise from not having it installed is that your "Check Engine" light may turn on from time to time. This for some has led to the engine shutting down at times. If this happens, just let it sit for a while and then it should restart. The software upgrade is a common occurrence for these vehicles. In six months we've had three upgrades.

Hope this helps.