the unity 5 UnityWebRequest GetAssetBundle(string uri, Hash128 hash, uint crc) when crc is not match. it not download new asetbundle . it not error and return .assetbundle is null . I must clear all Caching to fix it .
i really want to delete only only assetbundle not Clear All.
Unfortunately we rarely backport features like this, due to the complexity of doing so and the risk of introducing bug regressions and instabilities.