Would you like guidance on migrating legacy projects to CODESYS V3 instead, or help finding official support channels for your specific hardware?
Because CODESYS 2.3.9 is a legacy product, its compatibility with new operating systems and modern PLCs is limited.
To download Codesys 2.3.9, follow these steps: codesys 2.3.9 download
: Offers CODESYS Version 2.3.9.35 (SP9 Patch 35) for programming BL20/BL67 gateways.
Before jumping into the download, it’s worth understanding why this specific version is still sought after: Would you like guidance on migrating legacy projects
Having been patched and refined for decades, version 2.3.9 is arguably one of the most stable PLC programming environments ever created. Where to Find the CODESYS 2.3.9 Download
CoDeSys 2.3.9 includes several integrated utilities that streamline the automation lifecycle from design to deployment: Built-In Visualization Before jumping into the download, it’s worth understanding
To download anything from the official store, you must register a free individual customer account. After creating the account and confirming your email address, you can search for “V2.3” or browse through the product catalogue. For the actual V2.3 Development System, you will often be redirected to an archived download page that requires you to accept a license agreement before the download starts.
Ensure the Gateway Server is installed. This is the background service that allows your PC to communicate with the PLC.
The official and most secure way to download (specifically version 2.3.9.35 and related patches) is through the CODESYS Store or authorized hardware manufacturer portals. Because CODESYS V2.3 is a legacy system, it is often distributed by hardware partners alongside their specific "Target" files. Official Download Sources