The first thing you need to do, is grab the distribution files on NPM. You can do this either using yarn or npm.
yarn add @projectstorm/react-diagrams
npm install @projectstorm/react-diagrams
When you run this in your project directory, this will install the library into ./node_modules/@projectstorm/react-diagrams. You will then find a dist folder that contains all the minified and production ready code.
Install the peer dependencies
The library includes it's dependencies as peer-dependencies, so yarn will output warnings letting you know which ones are missing. Simple install them, specifically these ones: