If you use the retail version you can grab it here: http://em5.world-of-...gency.com/patch (621MB)
Steam should update automatically.
Dear EMERGENCY 5 players,
we would like to thank you for all the positive and fair feedback that reached us over the days after the release of EMERGENCY 5. We worked hard during the recent days to analyze every single feedback message. Also we want to express our gratitude for all performance test results EMERGENCY players have sent to us. We take this support not for granted and thank you very much! We want to communicate our further proceedings to all customers very clearly. All players shall be be able to see, if any difficulties they may encounter with functions or game performance are being solved by the current version. Most players have seen that we released a minor patch in the first days after the release which covered some bigger Problems. Now we have worked for one week on many important improvements which are listed below. Again, we would like to encourage you to give us any feedback. It is helping a lot. After this first major patch we will work consistently on the quality of the product. We will also include some important fixes which will take some time. We will inform you frequently about our next major update of the project. Thanks a lot to the great EMERGENCY Community for the fantastic support!Your EMERGENCY Team