A free trial version of Long Exposure Stacker is available. It is identical to the version of Long Exposure Stacker in the Apple App Store except that it puts a water mark on the images it generates and has a "Buy" button. Feel free to download it and use it as you wish and send feedback (under the "Help" menu item--"Email Developer").
Sometimes Apple's Safari browser does not place nice with Google Drive. If you are using Safari and having trouble downloading, try again using Chrome or Firefox.
Last updated May, 2025.