Download statistics for GitHub release assets are only available via the API. github-download-stats is a command line utility to fetch them for a specific repository.
Pre-built binaries for Linux, macOS, and Windows are available in the releases tab.
Docker images are also available:
docker run andrewsomething/github-download-stats
github-download-stats can be installed from source by running:
go get -u github.com/andrewsomething/github-download-stats
go install github.com/andrewsomething/github-download-stats@latest
Usage of ./github-download-stats:
  -api-endpoint string
    	API endpoint for use with GitHub Enterprise
  -json
    	Output in JSON
  -owner string
    	The GitHub repository's owner (required)
  -release string
    	The tag name of the release; excluding will list all releases
  -repo string
    	The GitHub repository (required)
  -token string
    	GitHub API token (default "")
  -version
    	Print version
github-download-stats -owner <owner> -repo <repo> -token <your_token>
github-download-stats -owner <owner> -repo <repo> -release <release_tag> -token <your_token>
github-download-stats -owner <owner> -repo <repo> -json -token <your_token>
github-download-stats is available via the MIT license.