It is a commercial product that requires a license. However, there are legitimate ways to access it for free or at no initial cost:

is a professional-grade photo editor and organizer that serves as a powerful alternative to Adobe Lightroom and Photoshop. While the 2022 edition is no longer the current version, it remains a robust tool for photographers who prefer a one-time purchase over subscriptions. Is it actually free?

Always download from the official ON1 website or verified distributors like Softonic to avoid malware. Key Features of the 2022 Edition The All-in-One Raw Photo Editor | ON1 Photo RAW