In the WWW.LoadFromCacheOrDownload documentation http://docs.unity3d.com/ScriptReference/WWW.LoadFromCacheOrDownload.html there are these issues:

1. There is a typo in the description of the "version" parameter. At the end of description there is "AssetBunlde" instead of the "AssetBundle"

2. The code example is only available in JavaScript. There are no C# and Boo examples

3. It is not clear how the CRC-32 checksum can be calculated. Maybe the link to the http://docs.unity3d.com/ScriptReference/BuildPipeline.BuildAssetBundle.html can be provided where this information is provided.