The extension is automatically included in the ZEN installation. To set it up, start the software and then proceed as follows:

1. Go to Tools > Options > ImageJ.
2. In the ImageJ Executable dropdown list, select your preferred ImageJ.exe.
3. If you prefer another executable or your preferred executable is not in the list, click on the last entry ... to search for it.

1. You have successfully set up ImageJ extension within the software. Now you can start working with the extension.