You can do it manually (if you wish). Here’s how to do so-

To install the extension,

• Log in the FTP, and then go to Magento 2 root folder (generally present under the public_html folder).
• Create a new folder named code under the app folder; under the code folder, create a folder named Ced.
  • Upload or Drag and Drop app/code/Ced/Kogan directory.
  • After successfully uploading the directory, the extension will be installed/upgraded.
  • Now run the following upgrade command in cmd
    

    php bin/magento setup:upgrade
    php bin/magento setup:di:compile
    php bin/magento setup:static-content:deploy -f
    php bin/magento indexer:reindex
    php bin/magento cache:flush

  • Once the extension is installed it appears in the main menu of the Magento panel just like this –