Opening older PsychoPy files
If you try to open a psyexp file in Builder and PsychoPy encounters code that it does not understand, the rest of the file will be ignored. Since the flow appears at the bottom of the psyexp file, the result will be an experiment with some routines (unless the first routine failed to load) but a blank flow.
At this point there are two solutions.
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Edit the psyexp file in a text editor to remove the element that is failing.
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Install the PsychoPy Legacy plugin (Tools => Plugin/packages manager).
At the time of writing, Patch and RatingScale components need the PsychoPy Legacy plugin to run.