Java 1.6.0 Runtime Environment Download Site

Java Platform, Standard Edition 6 (codename Mustang )—internally versioned as 1.6.0 —was a landmark release in the Java ecosystem. Launched in December 2006, it powered enterprise applications, desktop software (like Oracle SQL Developer and JDownloader ), and embedded systems for nearly a decade.

Java SE 6 JRE Downloads – Oracle Archive (Oracle account may be required for free download)