switch from Zend to IonCube?

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Hi. I purchased EPC, installed the Zend version, and had it working fine for a week (and i love it). But as of today it seems my host changed something and broke the Zend Optimizer so the calendar is gone, showing that nasty error page.

I asked the host to fix the problem, but if they don't/can't, how do i switch to the IonCube version? Do i need to download, install, and setup all over again? Will i lose my existing data or settings? What about my license.. will that be seamless, or a problem? And why is the Zend version preferred?

Thanks!
-todd