Hi,
you don't need any sql files, everything what you need is in upgrade.php script - it's executed if version of database mismatches version of epesi files. To update you need to leave old data dir so new epesi will know where is old database... If there is white screen and you have disabled "print errors on screen", there can be an php error that went to syslog or some file defined in php.ini.
Please take a look for that error and report here.
Thanks
Paul
