CDJ to SeratoDJ Pro: QUESTION ! Serious Answers

I have a gig this weekend, I will be using CDJs for my first time. I have SeratoDJ Pro. I watched a few YouTube videos showing how to connect CDJ to your MacBook (3 USB's to USB Hub, Link on CDJ, and it will work. "HID" Mode). However, My DJ friend just made me aware that I'd need to purchase the DVS expansion pack ($99 USD) in order to even use CDJ's with SeratoDJ Pro software. Is this is true? Please respond back as soon as possible; I'm freaking out cause I dont know if this is true or not.

If not true, are there any settings on SeratoDJ Pro that I will have to change to properly work with the CDJ's?

Thank you so much for the answers in advance!