Not able to open (Typset) ls. files

[Grant Freeman]

I have Mac OSX 10.4.3 and I downloaded Lilypond 2.9.2 after 
I click on Typset I get various error reports. 
Then I update syntax. I presume this updates the files. 
Similarly I get various error reports. The files that 
I've been trying to use are Mozart's March of the Priests from Magic Flute. 
I have also downloaded the PDF 
versions and are able to print them without any problems. 
The whole point of the LP version I thought was 
that I would be able to transpose the Basset Horn parts for clarinets. 
If not than I'll just scan into Finale. 
On the other hand is there someone I'm missing or misinterpreting?

Thanks for your interest.

Grant Freeman