UPDATE
Upon revisiting that question, the 2 files look identical in every way, but for some reason the downloaded version seems to work better. You have to replace it each time you update Sonar because Sonar overwrites the file with the bad one.
Now all 5 transport functions work and lite to show it.
To make it work:
1. Connect the UFX1204/1604 to your DAW by USB/Firewire.
2. Turn on the UFX1204/1604 while holding the FF button until "MAC" is displayed.
3. Open Sonar and open "Preferences - MIDI - Control Surfaces".
4. Click the yellow star to create a new controller.
5. Select "Mackie Control" from the dropdown menu.
6. Select the UFX1204/1604 for Input & Outut Ports.
7. Click OK.
8. Select "Mackie Control" in the ACT module.
All set. You should see the STOP button lit. Whatever button is active should be lit except for REW & FF which only lite when activated from the mixer, not from Sonar.
https://musicgroup-prod.mindtouch.us/04_BEHRINGER/XENYX-_How_Do_I_Set_Up_The_MIDI_Transport_Controls_On_My_UFX1204_Or_UFX1604%3F Thanks TMROX!