Build for mobiles impossible

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In PUN Wizard I read that "Build for mobiles impossible. Get PUN+ or Unity Pro for mobile or use Unity 5".
But in their site I read this(for FREE version): "Export to all Unity supported platforms with Unity 5.x Personal or Pro. Unity 4.x users can export to all platforms but iOS and Android."

I use Unity 2017.1.0f3. So can I build for mobile? Or I must install ONLY Unity 5 for mobile builds?

Thank you.

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