Plesk-Let’s Encrypt SSL

Overview - Let's Encrypt 

Let's Encrypt is a free, automated Certificate Authority (CA) which allows the rapid installation of SSL certificates. The latest Plesk Lets Encrypt extension provides this as an easy option for you to use.

Install - Let's Encrypt SSL  

Step - 1 Log into your hosting Control Panel. 

Step - 2 Click on the Website & Domains tab.

Step - 3 Click on Let's Encrypt.

Step  - 4  Select the check box Include www as an alternative domain name , even if you don't use www. as a prefix for you site. This is to ensure all redirects are also secure. 

Step - 5 Click Ok to save and the Let's Encrypt SSL will be generated and installed under your hosting in Plesk. 

Step - 6 Next we need to Select the Let's Encrypt SSL generated and force a redirect from HTTP to HTTPS as the webserver by default will load your website on HTTP.

Step - 7 Click on Hosting Settings: 

Step - 8 Under the Security section the below need to be selected. 

SSL/TLS support 
Permanent redirect from HTTP to HTTPS 
Let's Encrypt Certificate 

Step - 9 Click Ok to save and then check / confirm your Website is now loading on HTTPS and no SSL warnings.