Oracle likes to confuse you sometimes.
Are you looking to download Oracle JDeveloper 12c (188.8.131.52.0) to do your SOA and OSB development?
Download the two required files from here:
Extract them, then run the command:
java -jar fmw_184.108.40.206.0_soa_quickstart.jar
Do not download from either of these links:
- Oracle JDeveloper 12c (220.127.116.11.0) for SOA Suite and Service Bus