Installing CODESYS 2.3.9 on a modern 64-bit OS requires patience:
Once you have located the legitimate CODESYS_V239_Setup.exe (or similar naming), follow this guide:
| Problem | Likely Fix | |---------|-------------| | Installer crashes on Windows 10 | Use a 32-bit VM; the installer is 16-bit. | | Cannot connect to PLC | Check the gateway: CODESYS Gateway V2.3 must be running. | | Missing device | Download the correct Target Support Package (.tsp) from your PLC vendor. | | License expired | The 2-hour demo resets each time you start the PLC. For permanent use, buy a license via the PLC hardware key. | codesys 2.3.9 download
CODESYS 2.3.9 itself is free for editing, compiling, and simulation. However:
Downloading cracked versions is illegal and dangerous – they can inject ransomware into your industrial network. Installing CODESYS 2
The CODESYS Group maintains an archive legacy portal. You can sometimes find the installer through:
The CODESYS Group maintains an FTP/Archive for registered developers. You typically need a maintenance contract or a free registration to access the "Download Archives" section where 2.3.9 is stored as a .exe installer. Downloading cracked versions is illegal and dangerous –
If you are starting a new project, do not use 2.3.9. Instead, download the latest CODESYS V3.5 (free for programming). However, here is a quick comparison:
| Feature | CODESYS 2.3.9 | CODESYS V3.5+ | |---------|---------------|----------------| | Release year | ~2008 | 2013–present | | IEC languages | All (IL, ST, FBD, LD, SFC, CFC) | All + OOP extensions | | 64-bit support | No | Yes | | Modern hardware | Limited (legacy only) | All new PLCs | | Git integration | No | Yes | | Security | No encryption | TLS, user management | | Best for | Maintain old machines | New development |
Verdict: Only download 2.3.9 if you must support existing hardware. For learning or new projects, get V3.5.
