create an update.phpx file and paste the following rows:
<?php
exec("php /www/htdocs/<w022222>/path-to-nextcloud/console.php upgrade 2>&1", $out, $result);
echo "Returncode: " .$result ."<br>";
echo "Ausgabe des Scripts: " ."<br>";
echo "<pre>"; print_r($out);
?>
substitute
<w022222>
e.g. to your all-inkl.com-User a123456 and your
path-to-your-nextcloud
Then call this script via your browser…should work now 
as shown in the screenshot
