Re : Require_once?
InstallWithOnlyFtpAccess explains how to perform an installation with only FTP access, did you read it?
setup.sh only changes permissions AFAIK, anyway you can probably read the code to check. You can't execuit it if you have only FTP access, the page must mention how to replace its action manually.
My understanding is that Ftp-only and Safemode installs are at least twice harder to do than normal ones.
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