You’d have to ask WP engine I guess. I can’t say much without seeing the domain. But if you want to remove the plugin, do not deactivate through WP, but just remove the plugin through FTP. Otherwise you will revert to https.
I’m in trouble I have installed really-simple-SSL I got the webmaster error this plugin shows me using redirection so we need to fix and it takes time to redirect I want to uninstall this plugin for permanent also from .htacess but I haven’t ideas some have an about clean my website from really-simple-SSL? if want to check my website here https://www.startupopinions.com/