The is a community-archived or historically distributed compilation. Because the original online servers are long gone, collectors and digital preservationists compiled the most popular Reflexive Arcade titles onto physical DVD ISO images or massive compressed download packs.
Today, this Collector’s Edition DVD is highly sought after by software preservationists and retro gaming collectors. Because the original Reflexive servers no longer exist to authenticate digital licenses, the physical files on these DVDs are one of the few remaining ways to access the exact, unmodified versions of these games as they existed in the mid-2000s. Navigating Downloads: How to Play Reflexive Games Today
Which are you trying to play?