Error in file Installer.php

The very first digit on the file installer.php seams to be a space (or non visible digit). Impossible to launch the installation without removing this first digit.

Don’t know how to join the file, but here a copy for the 15 first lines

<?php
/* ------------------------------ NOTICE ----------------------------------

If you're seeing this text when browsing to the installer, it means your
web server is not set up properly.

Please contact your host and ask them to enable "PHP" processing on your
account.
----------------------------- NOTICE --------------------------------- */
namespace {
use Duplicator\Libs\DupArchive\DupArchiveExpandBasicEngine;
$disabled_dirs = array(
'backups-dup-lite',
'wp-snapshots'
);

Strange, the very first digit in the copy/past seams to be the <, but in the real file, the < character in in position 2. It’s sure and certain