Everything works fine once you figure out that you have to install the plugins within IrfanView.
- Click on IrfanView
- Click on Manage IrfanView
- Click on the Gear and Install Component
- Install IrfanView Plugins
- Install Ghostscript if you need it
Works great. Hope this saves someone some time. I struggled a bit to figure this out. You don't want standalone installations of the Plugin and Ghostscript...