Some parts of the macroalgae looked transparent when it arrived. Is the live algae going bad?

Normally not. It is normal with some macroalgae species when they get posted and they often need just a few days to adjust to the new environment.
It is as well normal with some macroalgae species that parts of it die off while adjusting to the new water environment. 
Please remove any transparent material as it may break down in your aquarium and release organic compounds. and the macroalgae should soon start to grow back.

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