It is no longer supported, there have been no new versions for a number of years, and it's now looking decidedly dated - there are other, better FTP programs available.
I use this one click here because it's just about the best FTP program around - at least I think so.
That said, FTP as a protocol hasn't really changed that much over the years, and what you use is a matter of personal choice.
None of what I've said is going to help you manage a commercial website, however - that's something that can be fairly demanding in terms of the skills required. Do have any web-design experience at all, or is this your first venture?