I had posted this a while back in a sub-thread but never got an answer:

"Sorry to bump this old thread.

How to go about for a site with age authentication buttons in more than one
page?On GOG dot com if you visit this page gog.com/en/game/metro_2033 you are
prompted to click OK on a big green button to view the contents of the page.
However, if you clicked OK and then say you visited another page which
required this age verification button, you are not prompted to click OK, you
can simply view the new page as you would any other on the site.

If I save a page with age verification button on GOG dot com, using the
method
described by user (William Roeder) about capturing the page with  the
browser's proxy settings, will this be valid across
all other pages I instruct HTTrack to save?In other words, Do I have to do
this manually for all the pages I want to save
or will doing it once suffice? Do I need to enable cookies in HTTrack?Thanks."