JOSHR  Fyi, Mac OS X Preview works for converting multiple images into a single PDF very easily.

1. Drag folder of images onto Preview application

2. Drag thumbnails in sidebar to order

3. Command-A to select all

4. Command-P to print -> save to PDF

Save your $40  
(Version 1.0.1)

JOSHR  Actually, "Save As..." in Preview does work for converting multiple images into a single PDF very easily.

1. Select image files in Finder

2. Double-click to open in a single Preview window

3. Drag thumbnails in sidebar to order

4. Command-A to select all

5. Command-P to print -> save to PDF

Voila! No embarassment, no hassle, no $40. No offense to the developer, of course.  
(Version 1.0.1)

JOSHR  If you navigate into the application package and execute the binary file directly, the Terminal displays a ZeroLink error.

Obviously the developer forgot to disable Xcode's ZeroLinking when he compiled this version.  
(Version 1.282)