between the Continuous and Classic tracks, or perhaps a breakdown of the current AI features

This is the modern, subscription-focused version most people get from Adobe's website. It's constantly evolving, with new features (including AI tools) added regularly. You'll always have the latest version, with the latest version numbers, such as the planned update 26.001.21563 from May 2026.

Launched in 2012, this was the final version under the classic "Reader" naming convention. It expanded form-filling tools, enabled full commenting and highlighting for free users, and introduced Touch Mode for Windows 8 tablet devices.

This version marked a turning point by becoming entirely free to download. It introduced the first web browser plugin, allowing users to view PDFs directly inside Netscape and Internet Explorer. It also introduced support for forms and embedded search tools.

A specialized version developed for Windows 8/10 tablet devices optimized for touch gestures and stylus input.