You'll need to perform a manual install. There's a thread here
that has the basics, the differences I'd note are:
1) Make sure you install TBP to a DIFFERENT folder that you install Freespace/FSO into (it's tons simpler this way)
2) Use Zathras 2.8
3) Use wxLauncher to set the lighting options, flags, -mod settings, etc
4) You can use the same FSO exec that you downloaded with the Freespace Open Installer (i.e. from your other thread) EXCEPT that you need to use FSO 3.7.0 (and not 3.7.2RC5) - there's an issue with TBP and 3.7.2RC5. Anyway, just copy it over, or if you know what a soft-link is use one of those.
Per your other thread, post if you have any issues and we'll see what we can do to help out.