Launch Nitro PDF Professional. Go to . You should see: Version: 6.2.1.10 (64-bit)
, it is now considered a "discontinued release" under Nitro's official Sunset Policy. Core Features of Nitro Pro 6.2.x Creation & Conversion
Nitro PDF Professional is a powerful desktop application used for creating, editing, converting, and securing PDF files. The version number (last updated around 2011-2012) represents a mature iteration of the software just before Nitro transitioned to the "Nitro Pro 7" generation.