Bob, there are many different printers and drivers. And just as many
different sets of installation directions. Some require the old drivers and
printer to be removed, some do not. It can be important whether the printer
is even connected. This makes it difficult to tell you exactly how to
install it.
Usually you can find the directions for installing the downloaded drive for
your printer right at the download site. Suggest going back to the site and
look around or search for "install driver" in the online technical
documents in the web site's support area.