datatables.net/jszip not found on packageist

I wanted to add a new set of files via composer to my project. Based on my selection of needs, the Composer tab spits the following:

php composer.phar require datatables.net/jszip
php composer.phar require datatables.net/datatables.net-dt
php composer.phar require datatables.net/datatables.net-buttons-dt

but with composer I can't find the first one (I can successfully get the other two) - I get a _Could not find a matching version of package datatables.net/jszip. Check the package spelling, your version constraint and that the package is availab error.

and to confirm I did not find it on packageist, as you can see here - https://packagist.org/?query=datatables.net/jszip

any thought on what to do? Thank you.