Migrating zend encrypted website between servers

Question

I've been given the task of moving a zend encrypted website (the previous owners fell out with their developers and now they don't have the decrypted version).

It's based on the php framework Kohana, (which unfortuantely i've never used)

I've done all the webserver setup, right version of zend optimizer etc but I can't get past this error:

An error was detected which prevented the loading of this page. If this problem persists, please contact the website administrator. /LINK/system/core/Kohana.php [199]: Kohana::setup(): Filename cannot be empty Loaded in 0.0587 seconds, using 1.22MB of memory. Generated by vsCommerce v3.3.10

I can't look in Kohana.php as it's encrypted.

Any suggestions?