Nitro no longer supports version 12 for updates or security fixes. You can still find archived installers from Nitro’s official legacy downloads (if you have a valid license key), but it’s not recommended for new systems due to security risks.

: This is the only version 12 build officially compatible with the current Nitro Activation Servers.

Nitro Pro 12.16.9.574 is a specific build in the Nitro Pro 12 family of desktop PDF tools. Below is a concise, user-focused guide covering what this build represents, typical fixes and improvements you might expect in a point release, practical workflows, troubleshooting tips, and recommended settings to get the most from Nitro Pro 12.

For everyone else, Nitro Pro 14 (or the free alternative, PDF-XChange Editor) is the safer, future-proofed path.

Nitro Pro 12.16.9.574 is the final stable build of version 12 in the Nitro PDF productivity suite. This specific version is a critical "bridge" release for users who own a perpetual license for version 12, as earlier builds can no longer be activated due to server upgrades. Technical Specifications : 12.16.9.574 Release Date : Final update for the v12 cycle (approx. 2021)

: Nitro shut down the activation servers for version 11 and older.