By purchasing a license to Git Updater you will be able to use authenticated API requests. This allows use with private repositories. Some git hosts require authentication for all API calls. GitHub does not require authenticated API requests for public repositories.
A 14-day free trial with authenticated API requests is provided.
A Git Updater license subscription currently costs US$19.99/year for an unlimited license.
A non-licensed/free plugin will not be able to make authenticated API requests and, as such, will not work with private repositories or with whichever git hosts require authentication for all API requests.