The Tapatalk mod for SMF is no longer available on the official mod site. Additionally, I believe it introduced a number of CSS security issues and they weren't very regular with their updates, which (I think) may have been why it was removed. Lastly, it would interfere with regular browsing from mobile devices and harass the users into installing the Tapatalk app.
The only official version that I know of for SMF 1 is for a much-older version of SMF 1.1.11:
http://www.tapatalk.com/activate_tapatalk.php?plugin=smfI'd recommend if you use the Tapatalk app and enjoy it, to
ask the Tapatalk devs to take SMF support more seriously, and to not introduce code that annoys regular mobile users in an attempt to force them to install their app.