There is no macOS installer, But I run it on a Mac using homebrew. if you install [email protected], then you can npm install -g [email protected] and saltcorn setup, choose the development option to use SQLite. You can also install postgresql with homebrew, and create a configuration file. 

On my Computer and the configuration file is expected at /Users/USERNAME/Library/Preferences/.saltcorn, If you run saltcorn info it may tell you the configFilePath for your install.

this is my config file for running on macOS under homebrew against postgres

{

  "password": "mypassword",

  "database": "saltcorn",

  "host": "localhost",

  "user": "tomn",

  "session_secret": "arandomstring",

  "multi_tenant": false

}