Did you manage to fix this?
Its the last one I can't resolve: PHP Deprecated: Function get_magic_quotes_gpc() is deprecated in /var/www/vhosts/mydomain.com/httpdocs/forms/includes/filter-functions.php on line 18'
tonyrobbo If you're still receiving support you should still be receiving updates, in which case the solution is simply to upgrade Machform. The line in question isn't present in v14, let alone v15. Not sure how old your installation is, but seems like you may need to update.
Magic Quotes is not needed (I thought it was removed back in PHP 7.0 (few years ago)).
"deprecated" means "obsolete".
I would contact Appnitro via a formal support ticket, through your member's area.