To run the website, download the code from the zip file and then navigate to the folder containing the front end and the back end folders.
Then start the backend server as follows
cd Back End
npm install
nodemon app
This should start the server at port 5001 of your localhost. The next step is to run the code for the front end.
In another terminal window, do the following
cd Front End
npm install
npm start
This should open the front end at localhost 3000 of your system, thus you must be able to run the full stack app.