CODESYS 2.3.9 (specifically version 2.3.9.x) legacy development system is available for download through several official channels, primarily depending on the hardware manufacturer you are using. While CODESYS V3 is the current standard, V2.3 remains in a "service phase" for maintenance of existing industrial controllers. CODESYS Group Official Download Sources
General CODESYS Store: While the CODESYS Store primarily focuses on version 3.5, you can sometimes find legacy setup files under the "Engineering" or "Archive" sections. 2. Installation Steps
Legacy Hardware: This version is primarily used for older PLCs that do not support the newer CODESYS V3.5 (SoMachine, e!Cockpit, etc.). codesys 2.3.9 download
Disclaimer
Disable Antivirus: It is highly recommended to temporarily disable antivirus software during installation to prevent blocks on communication drivers. CODESYS 2
Since CODESYS 2.3 is often "rebranded" by hardware manufacturers, the best way to get a version compatible with your specific hardware is through the vendor. WAGO: Search for "WAGO-I/O-PRO" (their version of 2.3.9). Eaton: Look for "xSoft-CoDeSys."
User experiences highlight several quirks regarding stability and versioning: Since CODESYS 2
Important legal and practical considerations: