How to port themes (skin) created Godot 2.1 to Godot 3.0?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By DimitriyPS
:warning: Old Version Published before Godot 3 was released.

How to port themes (skin) created Godot 2.1 to Godot 3.0?

I really need help!