Answer:

In June of 2014, Bentley Piping for AutoPlant, Bentley Piping for PlantSpace, and AutoPIPE StressISO were removed from the ELS license file and replaced with AutoPLANT Modeler/ OpenPlant Modeler. Therefore, AutoPIPE 09.06.01.xx and lower uses StressISO by Alias, requiring a StressISO Add-on license

AutoPIPE V8i 09.06.02.xx.and higher uses Stress Isometrics by OPIM, and does not require a StressISO Add-on license. However, the user must have either AutoPIPE Advance or AutoPIPE Nuclear Edition enabled in order to create a Stress Isometric