What potential issues can arise when a download module goes missing on a website?

When a download module goes missing on a website, users may not be able to access or download files that are essential for the website's functionality. This can lead to a poor user experience and potentially result in a loss of traffic and credibility for the website. To solve this issue, the missing download module needs to be reinstalled or replaced with a suitable alternative.

// Example code to check if a download module is missing and prompt for reinstallation

if (!function_exists('download_module_function')) {
    echo "Download module is missing. Please reinstall the module to enable file downloads.";
}