You can use the following steps to build the application and deploy it to IIS:
Open a command prompt, and navigate to the directory where you placed [InstallPath]\ClientExtension.
Run the command npm run build.
This command creates a new \dist folder, which contains the code that has been optimized for deployment. These files can be hosted on IIS and consumed using the Web Client.
Additional changes may be needed for some settings for the production build. For example, you might need to use https instead of http if configured for SSL or enable CORS.
View the browser console for any errors.