vendor/autoload.php is missing

[failpyre]

vendor/autoload.php is missing from the repo, but required in PicoContentEditor.php

When I try to install the plugin, I get this error:

{"reqId":"YMK3uXd0L25lwOzRYOkYAQAB8Qk","level":3,"time":"2021-06-11T01:09:19+00:00","remoteAddr":"[IP_ADDRESS]","user":"[USERNAME]","app":"PHP","method":"POST","url":"/index.php/apps/cms_pico/admin/plugins","message":"require(): Failed opening required '/home/[DOMAIN]/www/cloud/apps/cms_pico/appdata_public/plugins/yOv9TEVuUi/PicoContentEditor/vendor/autoload.php' (include_path='/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Crypt_Blowfish:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Date:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Exception:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Idna:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Imap_Client:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_ListHeaders:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Mail:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_ManageSieve:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Mime:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Nls:/home/[DOMAIN]/www/cloud/apps/mail/vendor/pear-pear.horde.org/Horde_Secret:/home/[DOMAIN]/www/cloud/apps/mail at /home/[DOMAIN]/www/cloud/apps/cms_pico/appdata_public/plugins/yOv9TEVuUi/PicoContentEditor/PicoContentEditor.php#2"}