Create a Free Let's Encrypt SSL Certificate in a few minutes (including Wildcard SSL) using these 2 websites below. I have used them, and it's working very well.
https://punchsalad.com/ssl-certificate-generator/
https://sslforweb.com/ssl/create
https://punchsalad.com/ssl-certificate-generator/
https://sslforweb.com/ssl/create