Why does this official TorBrowser link
{https://www.torproject.org/projects/torbrowser.html.en} show version
1.3.18, while this one
{https://archive.torproject.org/tor-package-archive/torbrowser/} and
this one {https://www.torproject.org/dist/torbrowser/} have 1.3.19 and
even 1.3.20?