Hi there,
a suggestion for your tool: You could save the images.zip file user independent location %ProgramData%\WinDynamicDesktop and your settings.conf to %AppData%\Roaming\WinDynamicDesktop.
This would make it easier to run your program from its own %ProgramFiles%-Folder without tinkering with folder permissions.
A downside to this is, that it would make removing your program a bit more involved, since the user would have to delete these folders manually. This would have to be mentioned in the README I guess.