But not much older than your Discourse version!
I have had some luck mirroring sites with wget. Something like
wget --mirror --page-requisites --convert-links --adjust-extension --compression=auto --reject-regex "/search" --no-if-modified-since --no-check-certificate --execute robots=off --random-wait --wait=1 --user-agent="Googlebot/2.1 (+http://www.google.com/bot.html)" --no-cookies --header "Cookie: _t=$COOKIE" https://forum.talksurf.com/
But you need to get the cookie named _t
Send me an email and I’ll see what I can do.