Go to http://floppy.museum/ for the HTTP version.
You may need to force your browser to do so by copying or manually entering the URL.
If you absolutely need to access using HTTPS, go to https://floppy.museum/index.htm.
Some links and images may not work, and you're defeating the purpose of the site..
(Don't worry though, I'll assume it's not your fault, so I won't hold it against you. :-) )