If you downloaded a legitimate, virus-free skin file from a trusted community creator, follow these steps to install it manually:
: It includes a hidden set of 8 different panels above the mixer. You can cycle through these using a small button located to the right of the headphone mix slider.
First, an important clarification: is not a separate software. "MixLab" usually refers to a skin (interface theme) designed for Virtual DJ 8 (often the free "Home" edition or Pro). Some download sites use "MixLab VDJ 8" as a search term for a specific popular skin or skin pack.