Instructions to import ZipStream into Moodle:

1/ Download from https://github.com/maennchen/ZipStream-PHP/releases/

2/ Copy the LICENSE file and the src folder into the lib/zipstream folder

3/ Ensure any dependencies are also imported (eg psr/http-message and myclabs/php-enum).
   The dependencies will be listed in the "require" section of the library's composer.json file