A limited demo version is technically available for trial.

If you are an existing customer, updates to version 1.6.x are free. Arts Acoustic reverb - ArtsAcoustic | because sound matters

While the official developer website remains online, the plugin has not received significant updates since roughly 2013 (v1.6.0.15).

Official support for the plugin effectively ended several years ago, which may make purchasing or licensing difficult on modern systems.

The is a classic algorithmic reverb plugin that was widely popular for its "lush" and "bright" sound, particularly on lead vocals. However, it is not free software ; it was originally sold for approximately 189 EUR/USD . Availability and Official Status