The download button above is for Million Dollar Script embedded into a WordPress plugin. It will install Million Dollar Script when you install the plugin. It can also update like any other plugin when a new version is released. It will download the update from this URL which in turn downloads it from the GitLab repository.
Instructions will follow but generally things will be simliar to the other plugin. You just don’t have to install Million Dollar Script, this plugin does it for you.
Note that this version of Million Dollar Script is modified and developed separately from the standalone install and currently changes are merged together on occasion.