Yes, the updates. From the Curious Labs site. Makes a big difference in speed and stability. Poser 4 only allows you to have one Runtime. But Poser 5 allows you to create multiple Runtime libraries. So you could have one for Vicky, one for Mike, one for the Millennium Kids, etc. Or maybe one for SF, one for fantasy, etc. But try to keep the main runtime - the Poser 5 runtime -- from getting too large. If it gets too big, it will really slow Poser down. For now, install the updates if you haven't. If you just installed P5, you probably don't have worry about your main runtime being too big. :-)