When you get the Hipster template from the MUI store, you will get a zip folder from the MUI store. Upon extracting the content of the zip folder, you will get the following content:-
It contains the source code of the template. The template is created by using CRA. You will find a Readme.md file inside it which will help you in setting up the project.
It contains the offline demo of Hipster. You can check this by using the following commands
yarn global add serve
serve -s build
this file contains online documentation of the template.