If you need to use an older version of Eclipse/Java/Python, below is the latest PyDev version to be used based on your requisites.
Eclipse 4.5, Java 8: PyDev 5.2.0
Eclipse 3.8, Java 7: PyDev 4.5.5
Eclipse 3.x, Java 6: PyDev 2.8.2
Python 2.5 or older: PyDev 5.5.0
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