It might be a good app, but like others have said, it is difficult to get running and the instructions always leave something out, like it's assumed you already understand database management.
I've tried this on Debian 10, and Manjaro. Manjaro seems like an easier process, but there is not much documentation or how to videos.
Maybe Ubuntu is better, but I'm giving up on Zone Minder. I'd be better off paying for something than wasting a bunch of hours going in circles.
It seems to be easier to install on Gentoo, but Gentoo is in itself an extremely involved process. Can't win.
I'm going to try Shinobi now.