Oracle Golden gate for Big data is a separate software than the standard Oracle Golden Gate, so you need to download it from the edelivery or the oracle site.

[oracle@edvmr1p0 ~]$ mkdir /u01/app/oggtrg
[oracle@edvmr1p0 ~]$ cd /u01/app/oggtrg
[oracle@edvmr1p0 oggtrg]$ pwd
/u01/app/oggtrg
[oracle@edvmr1p0 oggtrg]$ unzip /stage/V839824-01.zip              <- Unzip the binaries
Archive:  /stage/V839824-01.zip
  inflating: ggs_Adapters_Linux_x64.tar  
  inflating: OGG_BigData_12.3.0.1.0_Release_Notes.pdf  
  inflating: OGG_BigData_12.3.0.1_README.txt  

[oracle@edvmr1p0 oggtrg]$ tar xvf ggs_Adapters_Linux_x64.tar       <- Unzip the handlers
AdapterExamples/
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