Will adding SSL certificate to my site break my existing files and PHP web-softs?

Hello. I noticed that in softacolous auto installer, when you want to install a new PHP web-software it asks you to select HTTPS or HTTP. I am just worried, that if ill add SSL certificate to my website, that then my web soft will stop working because i installed most of my website with HTTP selected. I suppose that most likelly it’ll not break, anyways i decitted to ask here to make sure.

Your website will never break because you installed an SSL certificate.

However, if your site is installed on http and you want to switch it to https, you may need to update your website’s settings to ensure that it uses https URLs. If you don’t, you may get SSL errors when visiting the site over HTTPS.