Download Really Simple SSL Pro. If you want just a few pages on your website on SSL, just one page not on SSL, this plugin offers this possibility. In the settings you can add pages, posts, or any other post-type or even custom post types that you want to be on SSL. This plugin needs to be installed instead of Really Simple SSL, and is not meant to be an add-on. You can take a look at the instruction video to see how the plugin works. Take a look at the demo site to see how a site can switch between SSL and non SSL with the help of this plugin.
If your license is activated, you should be able to update from the WordPress plugins dashboard. If this doesn’t work, there’s probably a configuration issue on your server.
Installing the free version of the plugin is done via the WordPress plugins overview. In WordPress, go to ‘Plugins’, click on ‘Add new’ and type ‘Really Simple SSL’ in the ‘Search Plugins’ search box. Really Simple SSL will show in the results. Pressing the ‘Install now’ button will install the plugin, pressing ‘Activate’ will activate the plugin.
After activating the plugin, the plugin does some checks on your site. Then you can click “Activate SSL”. Before pressing this button make sure your website has a valid certificate. This can be tested at the Qualys SSL Labs SSL Test.