If this template helps then use it. If not then just delete and start from scratch. OS (e.g. Win10): Mac OS 15.7.3 PsychoPy version (e.g. 2024.2.4 Py 3.8): 2025.2.4 Standard Standalone Installation? (y/n) Y If not then what?: Do you want it to also run online? (y/n) N What are you trying to ach…

Try deleting appData.cfg to reset the preferences. [image] Launch Error Mac Other Hi, PsychoPy used to work on my Mac. I saved an experiment and now I get this message whenever I try to open PsychoPy: Launch error See the py2app website for debugging launch …

When we do this, it won’t let us open the builder or do much of anything else. Is there any other idea you have? We also tried to downgrade to 2025.2.2, the previous software version.

Try here [image] Can't launch plugins/packages manager Builder I need to install pygame (among other plugins) but am unable to do so. PsychoPy seems to believe it is not connected to the internet and, perhaps helpfully, gives this error message: Traceback (mo…

Error opening Plugins/Packages Manager

Builder

wakecarter January 15, 2026, 10:44pm 2

Try deleting appData.cfg to reset the preferences.

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Error opening Plugins/Packages Manager

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