look up Dante Design UTAU nib, you should find a website called dante designs or whatever, go there, install the nib provided and follow the directions on the website to put it in UTAU folder. this should let you bypass the code permanently if done correctly.
you can also try running windows UTAU on mac however it is not convenient and did not work for me. i like UTAU synth more because you do not have to worry about locale and i think it auto VCVs too. however no resamplers.