Error : XML document must contain a root level element in paypay_functions.php

[DrByte]

OK, but it is going to have to adapt to it eventually. I think it is a backward step to go for out-of-date versions of PHP. Let's not be defeatist about this and find out how to adapt it. I have already got it working.

Ya ya ya ... a new version will be released shortly which *will* be PHP 5.3 compatible.
There's no point building a backwards-compatible adaptation for the older version.

In the meantime, I'm glad to hear you've got a workaround for one of the warnings.

But the more effective workaround for Zen Cart v1.3.8a and older would be to use the prior version of XAMPP.