Atomix does not officially release a "portable" version of Virtual DJ Pro 8. However, there is a gray area:
Copy the contents of C:\Program Files\VirtualDJ into that folder. atomix virtual dj pro 8 portable
Since Pro 8 is legacy software, you can find second-hand licenses on eBay or Knockout Deals for $30-$50. Activate it once, then use the official portable creator. Atomix does not officially release a "portable" version