Hello James,
Thank you for asking.
Those files are from other dependency packages. The dependency packages are listed with links to the respective pages here in the package page Download tab:
phpclasses.org/package/9-PHP-PHP-ma
...
If you use PHP Composer tool, you can install those packages automatically. The page above has the configuration lines for PHP composer configuration file composer.json . Just click on the Install with composer button after you are logged in the PHP Classes site.
Can you try these instructions and reply here to let me know if it works for you?