Unity3D 历史版本的下载地址
方便有特殊需求要下载老版 Unity3D 的开发者们例如:
Unity3D 3.0.0 下载:
Mac版:http://download.unity3d.com/download_unity/unity-3.0.0.dmg
Win版:http://download.unity3d.com/download_unity/UnitySetup-3.0.0.exe

Unity3D 3.1.0 下载:
Mac版:http://download.unity3d.com/download_unity/unity-3.1.0.dmg
Win版:http://download.unity3d.com/download_unity/UnitySetup-3.1.0.exe


如想下载3.4.2版本，可以尝试
Mac版:http://download.unity3d.com/download_unity/unity-3.4.2.dmg 真的可以下载的