How Do How Download My Site

I built a website for our wedding in 2019 using the web builder software. I understand this facility as now been removed and so I would like to download a copy of my site on to my computer so I can edit the old fashion way using an html editor, however I can’t find anyway to download my files; the file manager only offers an upload facility.

Please can anyone provide instructions of how I download my website files to my computer?

Thanks

Robert