Yes, just to clarify- although you do need your Poser 5 serial number to purchase a Poser 6 upgrade, you'll need your new Poser 6 serial number to download updaters from either e frontier or Content Paradise- and you will also need to have registered your copy of Poser 6 with e frontier in order to download the SR1 updater. The e frontier site will ask you to enter your (registered) Poser 6 serial number to verify ownership before it lets you download the updater. Hope this helps! -- e frontier Technical Support