The Sound Blaster Audigy 2 (SB0240) (September 2002) featured an updated EMU10K2 processor called CA0102 to gain access to CA0151 which is a separate chip. Collectively CA0102, CA0151 was sometimes referred to as EMU10K2.5 (The CA0102 chip alone is just a version of Emu10k2).
Creative Audigy Audio Processor (WDM) Driver
File: sound-creative-sb-audigy-2.zip
f36d9d94a7a0c39301bba5c1bded1c89682d907f86af0f2fc00a4df88e0207ca
Creative Audigy 2 Driver
File: audigy2-dospack.zip
8b11376625dd9aba2f3bd58fa534e8d2b54fbdab6877b4d9a0a32b448589e863