Codesys 2.3.9 Download ((install)) | 2026 |

Generally stable. Most engineers run CoDeSys 2.3.9 on Windows 10 without major issues, though you may need to enable administrator privileges.

Version 2.3.9 was never officially released for 64‑bit platforms of Windows Vista or Windows 7, and it does not support Windows 11 natively. However, many users have successfully installed it on 64‑bit Windows 10 by running the installer in compatibility mode (Windows XP SP3 or Windows 7).

: Check the CODESYS Download Center (registration required). Look specifically for the "CODESYS V2.3" archive section. 🛠️ Why Version 2.3 Still Matters

Right-click the setup.exe file and select Run as Administrator . codesys 2.3.9 download

In the same compatibility tab, check the box for Run this program as an administrator . This ensures the software can freely access your PC's serial and Ethernet ports for programming. Core Features of the V2.3.9 Environment

⚠️ In September 2022, Microsoft and CODESYS disclosed a set of 15 severe vulnerabilities (known as "PLC:Browse") impacting the CODESYS V2.3 web server component. If exploit code is executed, attackers can cause a denial-of-service state, leak sensitive data, or achieve remote code execution on industrial controllers.

Right-click the Setup.exe file and select Run as Administrator . Generally stable

Use the demo target (Simulation mode) if you do not have physical hardware, or input the license code provided by your hardware vendor.

32-bit application (runs in Program Files (x86) on 64-bit OS) Important Windows 10 and Windows 11 Workarounds

The CODESYS Forum has an active “CODESYS V2.3” section where many engineers share tips for keeping old machines running. However, many users have successfully installed it on

Use the Target Installer utility included in the download to load your specific PLC hardware profiles. Essential Post-Installation Tips Handling Target Files ( .tnf )

CODESYS 2.3.9 is legacy software (released around 2010-2013). It is not compatible with Windows 10/11 64-bit by default and is no longer actively developed. Use it only for maintaining existing equipment, not for new projects.

Visit the official CODESYS website or an authorized distributor and navigate to the download section. Search for CODESYS 2.3.9 and select the correct version (32-bit or 64-bit) for your system. Click on the download link to initiate the download process.