I just downloaded the latest version 2.11 / I have been using Tixati with no problems for over a year / great program .  The old version of Tixati worked fine / today with the new version when I click on the link to download the torrent the popup opens at the bottom of the screen when I click on open Tixati does not open or I get a page not found message / I am not a tech type person what do I do to have it work as cleanly as it did in the previous version ???

What you have there is simply a file association issue.

Go to Tixati's Settings -> Shell Integration and click on "Check Now" fo each item in order to re-associate Tixati with torrent files.

If the problem persists, then it's your web browser. In that case, go to your browser's options and make sure that Tixati is the selected application to handle torrent files.