You have several safe, effective ways to get the CDJ-3000 experience in Virtual DJ without cracking anything.

A skin is just a coat of paint. If you are serious about DJing, your priority should be:

Most files labeled as "cracks" for Virtual DJ skins are actually traps. Since Virtual DJ skins are essentially XML and image files, they don't need a "crack" to function—which means any .exe or .zip file claiming to be one is likely: