Try if this changes anything. On 'application/controllers/FilesController.class.php', try changing code on line 127 from:
if (FileRepository::getBackend() instanceof FileRepository_Backend_FileSystem) {
$path = FileRepository::getBackend()->getFilePath($file->getLastRevision()->getRepositoryId());
if (is_file($path)) {
// this method allows downloading big files without exhausting php's memory
download_file($path, $file->getTypeString(), $file->getFilename(), $file->getFileSize(), !$inline);
die();
}
}
to:
/*if (FileRepository::getBackend() instanceof FileRepository_Backend_FileSystem) {
$path = FileRepository::getBackend()->getFilePath($file->getLastRevision()->getRepositoryId());
if (is_file($path)) {
// this method allows downloading big files without exhausting php's memory
download_file($path, $file->getTypeString(), $file->getFilename(), $file->getFileSize(), !$inline);
die();
}
}*/
(just surround it between /* and */)