I see HTML comments in 500.pl like this
<!-- Code clip here in PRO version -->
IS there a PRO version? I don't see it on the website...
Well, this product doesn't seem to be very popular so we've shifted our attention to others. Hopefully we'll have some resources available to finish PRO version of Apache Easy Debug.
Apache Easy Debug will work with your Apache2 just fine. There wasn't a new version for quite a while. Let us know if you have feature requests for this script and we'll consider them.