Hello and Welcome to LinuxQuestions,
You do know that there's a version 5 out of BackTrack, right? If not, I advice you to download it and try it (live session maybe) to see if it supports your hardware out of the box. I'm not familiar with that card but you could see if there's a driver/firmware available in the repositories with:
(sudo) apt-cache search Atheros
In using the package manager to install something you have better control over updates/upgrades and so on.
What extension does the file you downloaded? Is it a source package, .deb, ...?