Not sure how you got that link, however that's not the default download link people go to when they go to the LW download page. The default page is the first one shown in the image I posted. Start from the beginning. Go to the LW download page as given in links I posted earlier. LW.org cannot be blamed if other sites or people bookmark the direct download link. I posted the /download/version link earlier but still forces users back to the default page. The link you gave is specifically OSX, namely /download/download.php?version=osx so someone has either directly posted that link on their site or bookmarked it.

The old version 4.18 is /download/download.php?version=last_osx