Comment on Technical Support by SEO Dave.
WordPress core has been testing under the PHP 7 environment and because of this has deprecated some PHP 4 code recently: https://make.wordpress.org/core/2015/07/02/deprecating-php4-style-constructors-in-wordpress-4-3/
In the Stallion Responsive 8.3 update I updated the relevant code to the PHP 7 compatible code so it should be PHP 7 compatible.
If anyone is running under PHP 7 would be helpful to have some feedback.
Update: Stallion Responsive 8.3 and 8.4 is PHP 7 compatible, but had some notices related to PHP 4 code (these are PHP notices, NOT errors) that PHP intends to deprecate in the future (could be deprecated in PHP 7.1 or 7.2 or….). Stallion Responsive 8.5 removed the PHP notices as well, see: PHP 7 Deprecated Constructor Error Notice.