The latest version of APSDS is 5.0i (7 April 2016).
Try before you buy! You are welcome to download and evaluate APSDS. There is only one version of APSDS – and you can use it in evaluation mode. In evaluation mode there is the following restriction: The TOTAL Pavement thickness must be 350, 635 or 1300 mm. Please note that the Automatic Thickness Design and Parametric Analysis features are de-activated in evaluation mode.