It's too bad this is abandonware. It is, and was, the best of its kind, in my opinion. Unfortunately, it crashes in High Sierra and Mojave if I try to open a large folder. I suspect the problem is with the OS rather than the app. It apparently won't allocate enough memory to the app. I've sent in reports to Apple, but, of course, the problem has not been fixed. Apple has always been laggard when it comes to responding to user issues. None of the other apps I've tried work as well, for my needs and workflow, as Viewit.