Extract and install again and wait for the "installation completed successfully" message.
Thanks for using SDImageGenerator. Seems like it's an issue with your installation. Could you please try this?
Download the latest version of SDImageGenerator v 2.0
1. Extra the SDIG 7z file to a nonsystem drive (other than a C drive)
2.Start SDImageGenerator and wait for the dialogue to close automatically. It will automatically set everything.
3. Now check again, it will work.