Cannot create temporary directory

[DaniloL88s]

Downloading the "Shortcodes" extension...

Cannot create temporary directory: /var/www/vhosts/rott-fer.it/httpdocs/wp-content/plugins/Unyson-master/tmp
Cannot create temporary directory: /var/www/vhosts/rott-fer.it/httpdocs/wp-content/plugins/Unyson-master/tmp

Already saw other issue and tried with this:

`/** Absolute path to the WordPress directory. */

if ( ! defined( 'ABSPATH' ) ) {
define( 'ABSPATH', DIR . '/' );
}

define('WP_CONTENT_DIR', realpath(ABSPATH . './wp-content/')); `

But the problem persists

[DaniloL88s]

Is there a way to download the extensions and put them on the server via FTP?
Do I need to create a folder (for ext.) on the plugin folder?