If your server has php zip extension, you may install a plugin by simply dropping the plugin zip file on the plugin page of the business suite. However, if php zip extension is not available, you may install it manually.
Follow these steps to install it manually-
Unzip the plugin on your computer. By unzipping, it will unzip in a folder with the same name as the plugin, do not rename the folder.
Upload the folder on the apps directory where the business suite is installed
Now visit the plugin page, which will show the plugin you upload.