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/Zalando 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 index:reindex
  php bin/magento cache:flush