Just in case someone stumbles here while trying to find the TargetDataGenerator:
1 - Download the Windows Samples: EasyARSense_3.0.1-final_Basic_Samples_Windows.zip
2 - Extract it
3 - In Visual Studio open the sln file inside the HelloARImageTargetDataGenerator folder.
4 - Set the key (the same for your app) inside main.cc (line 51)
5 - Place your image targets inside assets folder
6 - Change the target name on main.cc (line 77)
7 - Press ctrl + F5 to run the app.
8 - The etd files will be inside the HelloARImageTargetDataGenerator\x64\Debug or Release