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ModuleNotFoundError: No module named 'pyexpat'

Please help a rookie out!

PsychoPy version : 2021.2.3
What are you trying to achieve?: building a Posner Study according to the Youtube Tutorial Tutorial 1: How to make a Posner in PsychoPy (2020) - YouTube

What did you try to make it work?: follow the instructions

What specifically went wrong when you tried that?: ModuleNotFoundError: No module named ‘pyexpat’
Can I download that module somewhere?

I believe pyexpat is used in the opening of excel files, but it should be included in PsychoPy Standalone. How did you install PsychoPy?

Also could you post the full error stack as well as just the last line so we can check?