The filename "Nitro.Pro.Enterprise.x64.Portable.14.34.2.0.zip" refers to a specific, unofficial distribution of Nitro PDF Pro
Indicates that the software has been modified to run without a standard installation process. Portable applications run directly from a folder and typically store their configurations within that folder rather than writing to the Windows Registry. Nitro.Pro.Enterprise.x64.Portable.14.34.2.0.zip