If you have a valid v12 serial number, you must use the specific installers for this build: : nitro_pro12_ba_x64.msi x32 Installer : nitro_pro12_ba_x86.msi
In v12.16.9.574, convert to .xls rather than .xlsx . The older engine handles .xls more reliably. nitro pro 12.16.9.574
This build was released to address significant backend changes in Nitro's licensing systems. In early 2021, Nitro upgraded its licensing servers, which caused older versions (12.16.3 and prior) to lose the ability to re-activate. Build 12.16.9.574 was provided as a free update for version 12 owners to ensure their perpetual licenses remained functional on the new servers. Core Features and Capabilities If you have a valid v12 serial number,
: Sign documents and request signatures via Nitro Sign integration. Form Filling : Create and fill interactive forms. ⚠️ Known Issues and Limitations In early 2021, Nitro upgraded its licensing servers,