It is important to understand that Vijeo Designer is proprietary commercial software, not freeware.
Since Schneider Electric has moved to newer software, you cannot find version 5.1 on the main "Downloads" page for current products. To locate the installer: Vijeo Designer 5.1 Download
Direct Alternative: If you have a newer HMI (Harmony HMI 3000, 5000, or 6000 series), you should download EcoStruxure Operator Terminal Expert instead, as Vijeo Designer 5.1 will not work with those devices. It is important to understand that Vijeo Designer
Once you have successfully completed the Vijeo Designer 5.1 download, follow these exact steps to avoid corruption. Direct Alternative: If you have a newer HMI
A: Use Control Panel > Programs and Features to uninstall. Then run a registry cleaner (like CCleaner) to remove leftover Schneider Electric entries. Finally, manually delete %ProgramData%\Schneider Electric\Vijeo Designer and %AppData%\Schneider Electric.