Depends on your contract and workflow.
If you have access to using AutoPIPE Advance or AutoPIPE Nuclear version and would like to create a Stress Isometric, than Yes, download and install "OpenPlant Isometric Manager" and any prerequisites required. Again, remember that OPIM is a separate download and needs to be installed separately from AutoPIPE.
If you only have access to using AutoPIPE Standard edition, than No, do not download "OpenPlant Isometric Manager"
How do I download, install, and license AutoPIPE?
Bentley AutoPIPE