When you connect controllers to HMIs, select the option from the list in the view to specify the address. Otherwise, a corresponding message will be generated as soon as you intend to download a project to the HMI.
For Windows embedded HMIs, verify the following:
Make sure that the Windows service CODESYS Control is running on the Windows Embedded HMI.
Start the Vijeo-Designer Runtime to be able to download the application (for further information, refer to the Vijeo-Designer online help, chapter 25.7 Run the User Application).