Install the addon like every other addon by uploading it directly via SFTP or the control panel.
From control panel¶
For the control panel method you need php zip:
sudo apt-get install php-zip sudo yum install php-zip
Installing from archives must be explicitly enabled by adding the following line to src/config.php:
$config['enableAddOnArchiveInstaller'] = true;
Upload the contents of the “upload” folder to your root XenForo directory.