As far as I understood the history of Lightzone, the original authors have lately vanished and didn’t answer any email, and let the domain go. I’m glad @ktgw0316 forked the project and started bug fixing. I found his Release only beginning this year 2022. Sadly the executable was half working on my mac (Monterey). It starts, but misses a lot of icons, Photo refresh is laggy and tiles are missing. Well, I guess there is a lot to do 
By the way there is another (not that old) fork of Lighzone where @ktgw0316 is also participating. I suppose we should also invite Aries85 ? GitHub - Aries85/LightZone: LightZone is a photo editor for Mac, Windows, and Linux.