Anybody can tell me what's wrong with my code?

i create 2 scripts which are AutoBuildRecources.cs and InstantiateResource.cs
the AutoBuildRecources creates the .unity3d file that i need it in InstantiateResource.cs
my problem is the InstantiateResource.cs,because i don’t know why the lerpz model can’t appear when i click the download button in my scene,here’s the code

anybody can help me what’s wrong with my code?thx
by the way, both.cs file can compile

your “startDownload” function is a coroutine… which means when you wanna carry it out, you need to call it using StartCoroutine:

Info about StartCoroutine: Unity - Scripting API: MonoBehaviour.StartCoroutine

okay,i try to fix again,really appreciate about that