Transposing an entire score

[peter . gambie]

Thank you for your replies.
Unfortunately, I still can't make head-or-tail of most of them, so some more 
context might help.
The music I'm trying to transpose isn't mine. I downloaded it (quite 
legally!) from CPDL. I therefore have no control over which Lilypad version 
it is.
As I said, I want to transpose the entire file up by 4 semitones (from f to 
a).
I am (almost entirely) ignorant of Lilypad, having grown up on a diet of 
Sibelius and Cubase.

Lassus_Osculetur_me.ly
Description: Text document