Error after installation

[ethelserth]

Hello

I installed the extension by uploading the files in Magento root folder. However after install i get the following error :

Fatal error: require_once(): Failed opening required '/var/www/vhosts/aromataonline.eu/httpdocs/lib/Oyst/oyst-php/vendor/autoload.php' (include_path='/var/www/vhosts/aromataonline.eu/httpdocs/app/code/local:/var/www/vhosts/aromataonline.eu/httpdocs/app/code/community:/var/www/vhosts/aromataonline.eu/httpdocs/app/code/core:/var/www/vhosts/aromataonline.eu/httpdocs/lib:.:/opt/plesk/php/5.6/share/pear') in /var/www/vhosts/aromataonline.eu/httpdocs/app/code/community/Oyst/OneClick/Helper/Autoloader.php on line 36

Shall i make some actions with composer? Why i get this autoloading error?

[StefBrito]

Hello,

Thank you for your feedback. You just installed the source code and not the package that's why it is not working. You need to install the lib.
Moreover you will need an API key to continue the installation.
Can you contact me on my email stephane.brito@oyst.com
Thank you in advance.

[StefBrito]

You can find the full package here.
https://github.com/oystparis/oyst-1click-magento/releases/tag/v1.12.0

[ethelserth]

Thank you for your quick reply. I send you an email from my work mail, agis@artabout.gr