Microsoft’s official successor to FrontPage. Expression Web 4 was released as a free download before being discontinued. You can still find the original installer on Microsoft’s archive sites. It’s not portable, but it’s safe and compatible with modern Windows.
Since FrontPage is nearly 20 years old and doesn't support modern web standards like HTML5 or responsive design, consider these free alternatives: Front Page 2003 replacement [duplicate] - Super User download microsoft office frontpage 2003 portable new