Cannot open Plugin/packages manager in offline mode

Builder
1

OS (e.g. Win10): Win 11 24H2
PsychoPy version (e.g. 2024.2.4 Py 3.8): 2024.2.4 Py 3.10
Standard Standalone Installation? (y/n) Yes
Do you want it to also run online? (y/n) No
What are you trying to achieve?:

I tried to install the psychopy_eyelink plugin on an offline machine. I followed this guide ( About PsychoPy Plugins — PsychoPy Plugins v0.0.1) and successfully downloaded the wheel file from PyPI.org. However, when I tried to install it on the non-networked machine, I can’t open the Plugin/packages Manager from the Builder. It always return an error saying that “Could not connect to Pavlovia server”.

What did you try to make it work?:

I tried reinstalling PsychoPy but it didn’t solve the problem.

Link to the most relevant existing thread you have found:

What specifically went wrong when you tried that?:
Include pasted full error message if possible. “That didn’t work” is not enough information.

2

I did a fresh installation of PsychoPy 2025.1.0 Py 3.10 on the non-networked computer, and got the following error messages - hope it will be helpful:

Traceback (most recent call last):
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py", line 1574, in openPluginManager
    dlg = psychopy.app.plugin_manager.dialog.EnvironmentManagerDlg(self)
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\plugin_manager\dialog.py", line 48, in __init__
    self.pluginMgr = PluginManagerPanel(self.notebook, dlg=self)
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\plugin_manager\plugins.py", line 303, in __init__
    self.pluginViewer = PluginDetailsPanel(self.splitter, stream=self.dlg.output)
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\plugin_manager\plugins.py", line 862, in __init__
    self.info = info
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\plugin_manager\plugins.py", line 1049, in info
    releases = self.info.getReleases()
  File "C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\plugin_manager\plugins.py", line 278, in getReleases
    for release in info.get('releases', []):
AttributeError: 'NoneType' object has no attribute 'get'