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If the DLL from NuGet tries to download this unity package, by using this package you will able to download NuGet packages as a unity package and...
public UnityEngine.Animations.Rigging.TwoBoneIKConstraint Hand; void Start() { Hand.weight = 1; } this is a simple way to do that
I think this one (NDK r19a) will works: https://dl.google.com/android/repository/android-ndk-r19-windows-x86_64.zip
very helpful