Tip # 1 Find and install the version of NewGAN-Manager-1.2.1. Version 1.2.0 does not create or read an rtf file for me either.
Tip # 2, name the file you are creating rtf Faces regens. This may not be necessary.
Advice # 3 If it doesn't work, find and install the version based on python-3.8.5...