Sorry for the delayed response. I have asked our experts look if they can find something that might be causing this problem. I will update you once I get more information.

Here is what our technical experts found out. I hope instructions below helps you to solve the uninstallation issue.

Uninstallation issue is caused by a failure to remove registry data, which is used to determine if the uninstallation was successful. Workaround is to remove the registry data manually and then uninstall the software from Control Panel.

1. Run Registry editor by typing “regedit” to Run window which can be opened by pressing Windows key + R (or you can type “regedit” straight to Windows’ start menu) and press Enter.
2. Registry editor is opened. Now browse to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Tekla\Structures and delete “21.1 Learning” key (Right-click the key and select “Delete”) .
3. Next browse to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Tekla\Structures Environments and delete “21.1 Learning” key.
4. Uninstall Tekla Structures Learning from Control Panel – Programs and Features.