At least in the disk version of the game, all the music is stored in the 165,325,592 byte file '..\Divine Divinity\Run\dat\sound.cmp'. I don't see any reason that would have been changed in the download version, and I'd guess BrainBox's music extractor would still work (see
DD music).
The CRC32 value of the sound.cmp file is EDD9B582, if you want to check it with a program such as
Hash. There is also a file verification procedure in the
Troubleshooting Tips topic, for the disk version. With the download version, depending on the file, it may not be clear if any differences found are due to changes updating the game (at least the div.exe and configtool.exe files would be different) or corrupt files.
Yes, it would be best to shut down any non-essential programs, especially anti-virus, before installing or starting the game.
Sometimes I just leave stuff running (though I never have the real time portion of anti-virus programs going), but if I have any problems with performance or stability, then I'll start shutting down stuff first and maybe try a clean re-install.
