install extension from Slicer GUI

Support
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1

Hi,
I would like to use Slicer for brain segmentation of MR images I have installed Slicer stable version following the guidance. I run slicer GUI from Ubuntu 22 and click on “install extensions” I have tried many extensions but I always get the same error:

Retrieving extension metadata for PyTorch extension
Retrieving PyTorch extension files (extensionId: 660f9f7930e435b0e355f56a)
Downloading PyTorch extension (item_id: 660f9f7930e435b0e355f56a, file_id: 662a183e6a328ae4b08b3c12)
Failed downloading: https://slicer-packages.kitware.com/api/v1/file/662a183e6a328ae4b08b3c12/download

Note that I manage to install some extension from file like Monai auto3d seg however when I want to use it for segmentation I get:
Failed to install required dependencies.

This module requires PyTorch extension. Install it from the Extensions Manager.

and I have again the installeation problem

2

Could you try installing PyTorch extension through file installation method? I could download successfully from the link you posted, maybe try using a VPN?

After you install PyTorch extension, please try this:

3

Hi,
thanks! this seems to have worked though I noticed a few SSLCertificate errors during the installation of Pytorch. I then tried MNAI Auto3DSeg and I get the following error when running the segmentation:

HTTPSConnectionPool(host=‘objects.githubusercontent.com’, port=443): Max retries exceeded with url: /github-production-release-asset-2e65be/744050756/0ca59c89-8633-497e-92d4-6eb374333a50?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=releaseassetproduction%2F20250102%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250102T160758Z&X-Amz-Expires=300&X-Amz-Signature=6b52fb925d49e2a03099a690856ac1bb1ec7833d9faf2a613c741bec97a3b822&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3B%20filename%3Danatomy_and_icrh-v1.0.1.zip&response-content-type=application%2Foctet-stream (Caused by SSLError(SSLCertVerificationError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1129)’)))