Having the same issue on Mac (10.14.6 Mojave) with:
Traceback (most recent call last):
File "NewGAN-Manager.app/Contents/Resources/app/newganmanager/__main__.py", line 4, in <module>
main().main_loop()
File "NewGAN-Manager.app/Contents/Resources/app/newganmanager/app.py", line 430, in...