4.9????

That doesn't make sense... A 500 error that is resolved by downgrading PHP to 5.3??? Glad it's working, but it is compatible with PHP 5.6... Now if they had pHP 7.0 it is understandable that there was an issue.

Have you with your ZC 1.5.4 site applied the fixes applicable in: http://www.zen-cart.com/showthread.p...s)-with-v1-5-4