Quote Originally Posted by freya View Post
They are running PHP 5 and have customized their Apache for highest efficiency and stability. Not sure what that means about what they've done or how it would affect Zen Cart.

This is Siteground, btw.
Perhaps you might ask them for a detailed list of changes they've made since around the time you first started getting complaints.

The goal is to find out what's suddenly caused downloads to no longer be delivered reliably since they made the changes.