Poser has changed hands, it is no longer the property of Smith-Micro. It is now the property of Bondware/Renderosity. In order to get a working copy, you will need to download the free update from https://www.posersoftware.com/downloads. You will need both Install Poser.exe and support files to get started. If you have customized your Poser in any way, make sure that during the installation, select use existing preferences to preserve those changes. If you have your SN handy, download the extra content. Otherwise, you should be able to obtain it through Poser.