Well first off they should not be new files. You need to edit those actual files in Piwik.
piwik/libs/UserAgentParser/UserAgentParser.phpand so on. Open each file and actually edit what is released from Piwik. Unless you meant new version of the files. I think you best bet would be posting on his comments section, since he created the "hack" to get it working. I would check and make sure its actually finding the PiwikTracker.php file. My guess is its not. Have you tried running the site with something like Firebug running?