Use the version filter. Do not simply click the latest version. Look for the "Previous Versions" or "Archive" tab. Enter "1.280S" in the search field.
Navigate to: Support > Download & Document > Software & Drivers > HMI (GOT) > GT Designer3 gt designer 3 version 1.280s download
The file size is substantial (approx. 4–6 GB). Ensure you have a stable internet connection and at least 15 GB of free hard drive space. System Requirements for Version 1.280S Before initiating the download, verify your computer meets these minimum specifications: Use the version filter