How to redirect HTTPS to HTTP in WordPress?

Hello everyone, I need a bit of Help regarding my site.

There are two different versions of my site indexed in Google.

https://SITE NAME

and

http://SITE NAME [EDIT: MODERATOR: LINKS REMOVED]

Just type of both type of URL's in Google search and you will see both two in top positions.

But the problem is, I am only using the HTTP version, So, I want to redirect that HTTPS version to HTTP.

Is there any way to do so? either with a Plugin or Manually?