The Pro download page has not been updated yet. Probably need to wait until next week due to the weekend. I did inform them about the issue. They did update the Basic download page, not sure why the Pro download page was delayed. If you look at the Basic download page for old installers, that is how you will eventually see the Pro download page, with an option for 4.18 http://www.limewire.com/download/oldversion.php (this link is for Basic only, just showing as an example of what you will see later)