Hi @seckboy, thanks for posting.
SSLs can only be manually installed on cPanel hosting. If you are using an older hosting plan, one that is just labeled as Web Hosting, only SSLs purchased in the same customer account can be installed.
There's a very good chance that you're on the older web hosting and not the cPanel Linux offering that is standard today. I would give phone support or live chat a chance and they should be able to help you install it. I tried to find some documentation on the older servers but couldn't find any.
You should also consider upgrading to a newer platform as I believe the PHP only goes to 5.6 on the old hosting.
Once your issue is resolved,
please be sure to come back and click accept for the solution