Yeah, whmphp is a pretty old system. Time to upgrade, unfortunately
Tom Whiting, WHMCS Guru extraordinaire
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Agreed. Don't use something that is out of support or no longer in use. This will help you to keep up to date with the constantly changing technology and not fall into getting customers and placing them on out of date code.
I recommend Zamfoo, this is what we use and have been using since 2010. Since they've changed ownership and Webhats purchased them their support has been top notch!