Free SSLs often come as part of a package deal with a website builder or a security websites plan. Other free SSL certificates are issued by non-profit certificate authorities. But these types of certificates often come with some drawbacks. For one, the lifespan of most paid SSL certificates is 2 years. The lifespan of a free SSL certificate is 90 days, after which it must be renewed.
Also, most free SSL certificates do not come with any technical support. Installing an SSL certificate can be tricky, and using the technical support team that comes with a paid SSL certificate