this is kind of misleading...
"How Can I Download an Entire Web Site?"
The short answer...these days that is impossible.
You can download the HTML, CSS, JS, Images and any media files...but that is NOT the Entire website.
It would not be possible to download every PHP, XML, etc server side files because most systems don't tell you what files are needed. If you have direct links to each php file you could probably download them except for those that have die commands if they are accessed directly.
Databases are also impossible to download without permission to do so.
So with HTTRACK or Wget or any other kind of downloader...this question is not possible.
If the word "Entire" wasn't in the question then it would be a totally different conversation.