Alternatively use git submodules in order to have a way to easily update the theme from the source in case you have your site in git as well.
For this run the following commands inside your Hugo site folder:
If you checkout your site from a repository which has this added as a submodule (e.g. if you are using CI to deploy), execute following commands or put them into a initgit.sh file in your repository which can be executed by your CI:
$ git submodule init
$ git submodule update
In order to update all the existing submodules from their upstreams, you can either go into each submodule root folder and do the normal git pull or execute following command:
$ git submodule foreach git pull
After installing In order to see your site in action, run Hugo’s built-in local server.