Importing Unity Assets from Mac to Windows

  assets, import, unity3d, windows

I am just starting out with Unity and there are some assets that I am trying to import, however, they are for Mac. When I do import them I get an error:
Failed to import package with error: Couldn't decompress package UnityEditor.Web.JSProxyMgr:DoTasks()
I am not sure how to import them or if there is a trick to it.
I had a friend with a Mac who was able to open it and copy it to my machine, with no dramas.

Source: StackOverflow