the "scripts.php" is not a JMS multisites PHP code.
I don't know which is this "script.php" that use a parameter called "multisites" but this is not our component that provide such "script.php".
You should check your environment and try identifying who has created this "script.php".
If you want that we have a look on your server, this is also possible with our billable support that you can order at
www.jms2win.com/en/joomla-multisite?page...35&category_id=1
If you have a look in our distribution package you will never find a "script.php".