To install PHP-Nuke version 7.6, download it from the provided link. Ensure your hosting environment supports the requirements for PHP-Nuke. If you are using cPanel, you can manually upload the PHP-Nuke files to your server. Follow the installation instructions available on the PHP-Nuke HOWTO page for detailed guidance. If your hosting package includes older versions of PHP-Nuke through Fantastico, consider bypassing that and performing a manual installation for version 7.6.