You own a legacy license, work on a 32-bit DAW, and absolutely need project compatibility with 2009 sessions.
: Its pitch detection and shifting algorithm is often cited as having a punchier, more distinct "T-Pain" effect compared to the smoother, more natural sound of modern updates.
The Classic Sound of Auto-Tune Evo: Is Version 5.0.8 Still the "Holy Grail"?
Even a legal copy requires an iLok USB dongle or iLok License Manager account. If you don’t have a second-generation iLok, the plugin will run in demo mode (with periodic mute).
Macs and may cause stability issues on newer macOS versions like Sequoia Antares Support Center