Any website promising a direct download link to a .dmg file (Auto-Tune 5 installer) is either distributing malware or a broken crack. Furthermore, Auto-Tune 5 is obsolete. It was a 32-bit application. Modern Macs running macOS Catalina (10.15) or later .
Which (Logic, Ableton, FL Studio) are you using? I can point you to the best way to get that sound without bricking your computer!