In osCMax, the footer.php file is no longer used for anything. The page that controls the html for the footer is main_page.tpl.php in whatever tempate's directory you are using. If using the aabox template, the path is /catalog/templates/aabox/main_page.tpl.php.

To change the actual text in the footer, edit the file /catalog/includes/languages/english.php. If using other languages, be sure to edit those files as well.

The variables you want to change are as follows:

// footer text in includes/footer.php
define('FOOTER_TEXT_REQUESTS_SINCE', 'requests since');
 
define('FOOTER_TEXT_BODY', 'Copyright &copy; 2005 <a href="http://oscdox.com">osCDox</a>, <a href="http://aabox.com">AABox Web Hosting</a>,<br> Powered by <a href="http://aabox.com/ms2-max.html" target="_blank">osCMax 1.7</a>');