Scratchpad issues

sorry just 1 quick question…
Where can we download the square SDK in PHP (where it includes “autoload.php” so we don’t have to use unix to install anything and instead just upload to our webserver) ?

The files/folders we currently have are from years ago and consists of these files below.
Though it seems to work with at least searching for a customer, I’m not sure if it’s fully updated.

square/vendorsrc/.phan
square/vendorsrc/doc
square/vendorsrc/jsonmapper
square/vendorsrc/src
square/vendorsrc/tests
square/vendorsrc/unirest-php

square/vendorsrc/.gitattributes
square/vendorsrc/.gitignore
square/vendorsrc/.travis.yml
square/vendorsrc/autoload.php
square/vendorsrc/CHANGELOG.md
square/vendorsrc/composer.json
square/vendorsrc/LICENSE
square/vendorsrc/phpcs-ruleset.xml
square/vendorsrc/phpunit.xml
square/vendorsrc/README.md