I built my website years ago with MSFT Expression. Loved it. I got a new PC.

I might be able to locate my keycode for the program. If so, can I still go download it to my new PC or is obsolete?

If I can't use Expression anymore, what do I use?

Also, if I can't use Expression anymore, will their current program allow me to edit my current website that was built with Expression?

Thanks.