Runs well in a Virtual Machine

While this app is not working in El Capitan, it does run well in a virtual machine of an earlier OS, running inside El Capitan. I have VMware Fusion 8.1 with a Mountain Lion OS on a current MacBook Air - also gave it a successful try with Yosemite vm. One thing to keep in mind is to set the vm to use USB 2.0 (not 3.0) so it can connect with the camera. Problem solved and your main OS can be kept current. Sofortbild is just too wonderful to live without. I fire the camera with an Apple Bluetooth Keyboard (Command-r) as I walk around the studio set-up, adjusting the subject and lighting without unneccasary trips back to the tripod.

Haroldus Magnus about Sofortbild