I've downloaded the GPO4 and unzipped it successfully, but when I try to open a new sound bank for a channel, this error message pops up:
"Instrument Parser can't find audio files", then a list of the different "files.audio", (articulations, I assume), that can't be found. I've tried loading both Standard and Notation with the same result.
When I try using the Import command, I get a list of "Macro $...not defined", including about 10 cc and sw commands, in addition to the original error message.
On the advice of Garritan TS, I've downloaded it a second time with the same results.
Also, the first download resulted in corrupted files in the trombone section; the second download had corrupted pipe organ files.
I'm using a MacBook Intel 2 GHz Core 2 Duo, 4GB SDRAM, latest version of Leopard, 250 GB HD with about 120 GB free.