The good news: Applications like XnConvert, ImageOptim, and Polarr not only replicate but improve upon every feature of Picture Manager. They are free, updated regularly, and designed for macOS.

Then, Microsoft killed it. Office 2010 was the last version to include Picture Manager. On Windows, enthusiasts have found ways to extract and install it unofficially. But on a Mac? The situation is much more complicated.

Open the DMG file and drag XnConvert to your Applications folder.