No specific info about version 2.2. Please visit the main page of HDR Darkroom on Mac Informer.
Hydra Pro helps you create HDR images on your Mac.
HDR Darkroom 3 is a handy photo editor that helps you beautify your pictures.
HDR Express 2 is an application that allows you to create HDR images.
HDR PhotoStudio 2 helps you create beautiful high-dynamic-range images
HDR MAX is the first all-in-one high dynamic range imaging application.