Instructions should work for Windows, Mac and Unix.

Step 1) Install Node.js, version 10 and higher.
Note: Native async/await is the primary requirement for the version of Node.js used.

Step 2) Create a directory where the Node.js project will be run from, then use git clone to pull the GitHub repository for the project.
https://github.com/hookedupjoe/action-app-designer
Note: Running the backend process from the pulled repo allows for easy updates using git pull.

Step 3) Run npm install to run the installation.

Done, ready to run it and load in a browser.

Run npm start anytime to run it, generally that is in a script / batch file to run in the background.

Open a browser and go to http://localhost:33460/, this will open the designer.

Next: See creating your first application to get started learning the system and building apps.