Installing Composer Package

I can not install a composer package on my windows computer I needed because a Codeigniter documentation library depends on that package to run. I'm using Windows 7 with Gitbash and the composer is working perfectly. The package in question is:

apigen / apigen

link

and the command executed in admin mode is:

global composer require --dev apigen / apigen

The error screen is this:

I ask for help installing the library in my environment.