If you are looking to use HTTPS, I reccomend following this wordpress guide: https://make.wordpress.org/support/user-manual/web-publishing/https-for-wordpress/#implementing-https-for-wordpress
You can get a free SSL Certificate from: https://letsencrypt.org/
If you find difficulty setting it up, you can often pay your host a small fee to help set this up. Once set up, you just need to make sure all the links on the page are HTTPS and not HTTP. Really easy to fix with plugins like Velvet Blues URL.
The WordPress HTTPS plugin just makes implementing the SSL a bit easier. I would discourage installing old plugins as they often have security flaws and can conflict with your theme / other plugins.
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