If you want a DJ software for older computers, try:
Released by Atomix Productions, version 5.0.7 introduced features that defined the digital DJing era, such as a robust BeatLock engine and improved video mixing capabilities. It allowed bedroom DJs to transition from physical vinyl to digital MP3s with a visual interface that mimicked a traditional dual-deck setup. Key Features of the 5.0.7 Build Dual-Deck Interface: Virtual Dj 5.0 7 Free Download