You can grab the latest release from the Releases Page in Github or via NPM.
npm install @swimlane/ngx-charts --save
Also, the release code is checked in and resides here.
package.json file for the versions of angular ngx-charts is compatible with.
release/index.js - UMD Version
release/index.min.js - UMD Version Minified
If you want to run the demos locally, just do:
Browse to http://localhost:9999