Download the appropriate file (Mac or Win). However, it bears mentioning:
"This DFD (Direct From Disk) extension for the NI KONTAKT Player enables it to stream samples from hard disk. Garritan Personal Orchestra (GPO) and Jazz & Big Band (JABB) was specifically designed to run in RAM (Random Access Memory) and DFD is not recommended. GPO is a small footprint library and was not intended to stream from a hard drive. Large sample libraries may require disc streaming, but this library does not and is designed as a RAM based library. Our recommended requirements as stated in the license agreement call for a minimum of 1 (one) gigabyte of RAM in order to be able to load a complete orchestra. The vast majority of GPO & JABB Users meet the recommended requirements. So the old adage applies: "If it aint broke don't fix it". If you meet the RAM requirement, you do not need DFD."