I take it you are new to linux if so then BTrack is not the distro for you, It is a lot of commandline tools. But anyway to install a tar file Go to where it,s downloaded. /home/user/Downloads then
tar xvjf name/of/file.bz2
Then you cd into untarred dir there should be a install read file that will explain how to install.
According to the documentation you also need to install
I havn,t got bt5 so cant help with that.