Can't load library "prj_pjnq.dll" - Can't load library "prj_pjnq.dll" Description Due to a problem in the Quartus Prime Pro Edition Software version 19.1 for Windows* you may see this error when opening the Quartus Prime Pro Edition Software. This occurs because of missing libraries in the installation. Resolution To work around this problem, install the Microsoft Visual C Redistributable Packages for Visual Studio 2013 . Custom Fields values: ['novalue'] Troubleshooting 2007807743 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.3 19.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']