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You missed the instructions on the driver page to bypass the security within Mojave, allowing the full driver installation.

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I bought yesterday new MacBook and I downloaded the latest version of Serato DJ pro. I’m try to connect serato with controller (ddj z2) and it looks like it’s ready to mix in 2 channels in the screen for a second but it’s not accepting the controller, what should I do? Is that problem Cuase I have Mojave on MacBook?
You missed the instructions on the driver page to bypass the security within Mojave, allowing the full driver installation.

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Also when I’m trying to connect the controller, down left corner next to autoplay it says error : failed to connect audio