# install extension from Slicer GUI

**URL:** <https://discourse.slicer.org/t/install-extension-from-slicer-gui/40907>\
**Category:** Support\
**Tags:** extensions-manager, extension-manager\
**Created:** [December 30, 2024, 4:22pm UTC](https://discourse.slicer.org/t/install-extension-from-slicer-gui/40907 "2024-12-30T16:22:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![danieldeidda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/danieldeidda/32/78933_2.png) [@danieldeidda](https://discourse.slicer.org/u/danieldeidda)\
**Post date:** [December 30, 2024, 4:22pm UTC](https://discourse.slicer.org/t/install-extension-from-slicer-gui/40907/1 "2024-12-30T16:22:02Z")

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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](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

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<div class="post-metadata">

**Author:** ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)\
**Post date:** [December 30, 2024, 11:41pm UTC](https://discourse.slicer.org/t/install-extension-from-slicer-gui/40907/2 "2024-12-30T23:41:32Z")

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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:

> [@Why can not use dental segmentator?](https://discourse.slicer.org/t/why-can-not-use-dental-segmentator/40866/2):
>
> Please: Restart the program Click this button Click this button Try to use Dental Segmentator Report if it still does not work (and add logs or a picture of the problem)

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<div class="post-metadata">

**Author:** ![danieldeidda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/danieldeidda/32/78933_2.png) [@danieldeidda](https://discourse.slicer.org/u/danieldeidda)\
**Post date:** [January 2, 2025, 4:11pm UTC](https://discourse.slicer.org/t/install-extension-from-slicer-gui/40907/3 "2025-01-02T16:11:09Z")

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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](http://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)’)))