Download the latest version .zip file from your client area.
Unzip the downloaded .zip file into a directory of your choice on your PC.
Using a method of your choice, upload the files to your server where WHMCS is installed. Uploading the modules folder and all included subfolders and files to the folder in which WHMCS is installed will maintain the correct tree structure for the addon and associated files.
Once uploaded go to Setup->Addon Modules. If all has been uploaded correctly, you will see the entry in the 'Module' column titled "Domain Pricing Manager - eNom" where the version number has been updated to the latest version.
The module will be automatically updated the next time you open the configuration via the Addons dropdown menu.
From version 1.5.5 the module will also be updated when you open the module. NOTE: New setup features may require a refresh of the page once the module is open.
The current version number is displayed in the 'Module Information' section at the top of the sidebar when the module is open.