Windows 10无法使用AWS SDK for PHP v3与Composer

I'm a student and pretty new to web development so forgive me if I'm missing something obvious. I recently attended a hackathon and was on a team with experienced developers who were building an app for deployment on AWS using the the Silex framework. Everyone else was using a Mac, while I have a PC running Windows 10. When they integrated AWS PHP SDK v3 from packagist I was unable to run the I'm a student and pretty new to web development