If you have any software registered at MySAPIEN you will start to see additional downloads when you login.
For one, you will see the stand-alone installers for PrimalMerge 2012 and the SAPIEN Document Explorer there. If you are creating a custom install for PrimalScript or PowerShell Studio these two packages are installed as prerequisites and you cannot influence their installation path. By using these stand-alone installers you can install them in any other location than the default path.
Additionally you will see bonus downloads available here, such as the new PowerShell Profile Editor.