Enter Database Files?
The program is basically just a visualizer for images organized in folders in a specific way. The "How to Create a Database" PDF goes over how to make these, they're basically just folders filled with sub-folders that hold all the image files, which need to be named and organized in specific ways. Then you just paste the file path for the folder (found via the windows file explorer) into the program to have it load all the images and stuff and be able to view them.
It's a bit janky and it only works on Windows, but it works if set up properly