Plesk is a commercial web hosting data center automation software which was developed for Windows-based commercial hosting service providers. Plesk was designed to install and manage web hosting systems and applications on a single server. The control panel is designed to simplify the management and administration of the websites by automating various tasks on a single server. Install an extension from a .zip file or upgrade an already installed extension to a later version. The following command is used to upgrade an already installed extension from the mod.zip file.
plesk bin extension -g /tmp/mod.zip