(e.g., for legacy hardware or old projects), you would need an old Mac running macOS High Sierra (10.13) or earlier . The official VirtualDJ forums may have archived installers for registered Pro users, but downloading from unofficial sources is strongly discouraged.
: Originally designed for Mac OS X 10.5 (Leopard) or 10.6 (Snow Leopard) . virtual dj pro 7 download mac os x
Here is everything you need to know about downloading and running Virtual DJ Pro 7 on a Mac. Why Virtual DJ Pro 7? for legacy hardware or old projects)