Download link for previous versions of unity3d

Is there a download link to previous versions of Unity 3d? Especially 2.5?

Here is the download link to 2.5 pc:

http://download.unity3d.com/download_unity/UnitySetup-2.5.1.exe

and here is the link to 2.6 pc:

http://download.unity3d.com/download_unity/UnitySetup-2.6.0.exe

PC Editor: 3.0 | 3.1 | 3.2 | 3.3 | 3.4 | 3.4.2 | 3.5.6

Mac Editor: 3.0 | 3.1 | 3.2 | 3.3 | 3.4 | 3.4.2 | 3.5.6

iPhone: 1.7.0

PC/Mac installers, release notes and built in shaders are found at this web page dating back to Unity 3.0. It does not list 2.x content.

http://unity3d.com/unity/download/archive

http://download.unity3d.com/download_unity/unity-2.6.0.dmg