It is included in the Waves subscription bundles.
If you are looking for permanent free alternatives with similar functionality, consider these options mentioned by the production community:
If you want a permanently free plugin that accomplishes the exact same goal—adding harmonic excitement, air, and presence to your mixes—several high-quality, legal freeware options exist. 1. Fresh Air by Slate Digital Aphex Vintage Aural Exciter Free Download
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1. Waves Aphex Vintage Aural Exciter (Paid with Free Trials) It is included in the Waves subscription bundles
The Aphex Vintage Aural Exciter is a type of audio plugin that uses a unique algorithm to enhance and excite audio signals. Developed by Aphex, a renowned company in the audio industry, this plugin is designed to add warmth, depth, and character to your audio tracks. The Aural Exciter works by generating a unique type of distortion that is not harsh or fatiguing, but rather pleasing and musical.
Practical tips for using an Aural Exciter effect Fresh Air by Slate Digital This public link
Apply subtle excitation to a finished mix to add overall sheen, but use with caution to avoid harshness.