To download WHMCS (WebHost Manager Complete Solution), follow these steps:

1. Visit the WHMCS Website: Go to the official WHMCS website at https://www.whmcs.com/.

2. Navigate to the Download Page: Look for a "Download" or a similar option on the website's main menu. Click on it.

3. Choose Your Version: You may be presented with options for different versions of WHMCS. Select the version that is appropriate for your needs. As of my last knowledge update in September 2021, WHMCS was on version 8, but there might be newer versions available by now.

4. Login or Register: You may need to log in or create an account to proceed. If you haven't done so already, follow the prompts to create a new account.

5. Agree to Terms and Conditions: Read and accept the terms and conditions of using WHMCS.

6. Download the Installer: After accepting the terms, you should be provided with a link to download the WHMCS installer. Click on the download link to start the process.

7. Install WHMCS: Once the installer is downloaded, follow the installation instructions provided by WHMCS. These steps typically involve uploading the files to your web server and configuring the database.

Remember, if there have been any updates or changes to the download process after September 2021, please refer to the official WHMCS documentation or website for the most up-to-date information.