Where to download an old release package of Hadoop?

The download page of Hadoop http://hadoop.apache.org/releases.html only contains several recent release packages. I would like to download some old release packages such as Hadoop 2.5.0 which is not available anymore on the release page. Where to download a copy of the old release?

You can download the old release packages of Hadoop on the http://archive.apache.org site.

For the release 2.5.0 of Hadoop, you may find them at

https://archive.apache.org/dist/hadoop/common/hadoop-2.5.0/