FIX for Latexocr GUI: c10.dll and typing.io module error

[opanoel]

This is supposed to be a guide to help fix the "c10.dll loading error" and the "typing.io is not a package" error for people using newer Python and PyTorch versions, without having to downgrade either. I use Python 3.14.2, PyTorch 2.10.0+cpu and Windows 11 25H2.

I encountered some issues after installing the package using pip install "pix2tex[gui]" and calling latexocr in Windows Command Prompt.
After some digging I found some solutions spread throughout GitHub and decided to make this thread in hopes of simplifying the troubleshooting for other people having the same issues.

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1. To fix the c10.dll error I followed solution 3 from pytroch/issues/166628, which I found through latexocr error #436.
   The solution states to import torch before PyQt. I did so by going into \pix2tex\gui.py and adding import torch below import tempfile.

2. After fixing the c10.dll error, I got a new error: ModuleNotFoundError: No module named 'typing.io'; 'typing' is not a package. I found this solution:

I have tracked down the problem. The issue is that pix2tex[gui] requires latex2sympy2 which requires antlr4-python3-runtime==4.7.2.

As can be seen in issue #2611, antlr4 was the reason for this bug, but it was fixed in #3067 and in antlr4 4.9.2.

A workaround could be to manually update antlr4 to a version >=4.9.2:

pip install antlr4-python3-runtime==4.9.2

Originally posted by @Giuseppe499 in #415

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It should be noted that the Sympy format seems to not function properly after this fix.
I am not knowledgeable enough regarding these things to know exactly what I am doing, but this is what allowed me to use the GUI.
I hope someone can make use of this, as I have looked for something similar to this during my troubleshooting.