# Install ModalityConverter

**URL:** <https://discourse.slicer.org/t/install-modalityconverter/46308>\
**Category:** Support\
**Created:** [February 26, 2026, 7:26pm UTC](https://discourse.slicer.org/t/install-modalityconverter/46308 "2026-02-26T19:26:18Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jmarichal](https://avatars.discourse-cdn.com/v4/letter/j/51bf81/32.png) [@jmarichal](https://discourse.slicer.org/u/jmarichal)\
**Post date:** [February 26, 2026, 7:26pm UTC](https://discourse.slicer.org/t/install-modalityconverter/46308/1 "2026-02-26T19:26:19Z")

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Hi,

New user here! I’m trying to download the ModalityConverter extension: [GitHub - ciroraggio/SlicerModalityConverter](https://github.com/ciroraggio/SlicerModalityConverter).

When trying via the extension manager, I got the following error message. So I went on [extensions.slicer.org](http://extensions.slicer.org) in order to do a manual installation (for Windows), but I can’t find the module. It’s supposed to be under the ‘Image Synthesis’ category, which isn’t present either. Did anyone experience a similar issue?

Thanks for the help!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/4/44da32bf99b63c2121f46eddd2d55a5876c911d3.png)

 ![image-1772099183208-sa6t4xifs](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/e/ced82cc01a6a6bd0f40c359ea053fc541dc72d58.jpeg)

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**Author:** ![ciro.raggio](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ciro.raggio/32/67012_2.png) [@ciro.raggio](https://discourse.slicer.org/u/ciro.raggio)\
**Post date:** [February 26, 2026, 7:47pm UTC](https://discourse.slicer.org/t/install-modalityconverter/46308/2 "2026-02-26T19:47:29Z")

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Hello, thank you for writing. May I ask which version of 3D Slicer you are trying to download the extension from?

ModalityConverter can only be downloaded from the Extension Manager from version Slicer 5.9 onwards. I don’t understand what the error is, but it seems more like a download problem than an extension problem.

If you can’t find the extension with Slicer version higher than 5.9, then you can clone the repository and import it manually!

Let me know if you can do it, otherwise I’ll guide you step by step. 😀

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [February 26, 2026, 7:57pm UTC](https://discourse.slicer.org/t/install-modalityconverter/46308/3 "2026-02-26T19:57:19Z")

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I suspect the download failed because of Zscaler:

> <https://github.com/Slicer/Slicer/issues/8815>
>
> \## Summary
> 
> When trying to install new extensions, the download fails. I am runn…ing Zscaler Internet Security on my device.
> This software acts as a Firewall for all web traffic. The logs indicate a SSL inspection error, likely the result
> of an untrusted certificate.
>  
> Does 3D slicer support intermediate certificate to be pinned, and if so what trust store does 3D slicer pull its
> certificates from? (i.e Java, Python, ect.)
> 
> \<img width="329" height="347" alt="Image" src="https://github.com/user-attachments/assets/45bf35f1-3ba7-4a91-a040-233e86aca407" /\>
> 
> \## Environment
> \- Slicer version: Slicer-5.6.2
> \- Operating system: Mac 15.7.1

It’s an issue that affects me as well with my company issued computer.

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<div class="post-metadata">

**Author:** ![jmarichal](https://avatars.discourse-cdn.com/v4/letter/j/51bf81/32.png) [@jmarichal](https://discourse.slicer.org/u/jmarichal)\
**Post date:** [February 27, 2026, 3:40pm UTC](https://discourse.slicer.org/t/install-modalityconverter/46308/4 "2026-02-27T15:40:26Z")

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Hello,

Thanks a lot to both of you for your answers. A small update: I was finally able to download the module. I noticed some new extensions where popping up when refreshing the page on [extensions.slicer.org](http://extensions.slicer.org/). So I kept refreshing it until ModalityConverter appeared, and then did an Install from file. Now I see it installed in the extension manager, but not in the module list, so I can’t use it. Any idea on how to solve it? I am working with version 5.10.

Thanks!

Joachim

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/7/b7a77cc74b8505df2db0fc68b7779184faed0a25.png)

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/b/1b1ffae6ad64663f4f44e1765b98aefc0fa66213.jpeg)

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<div class="post-metadata">

**Author:** ![ciro.raggio](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ciro.raggio/32/67012_2.png) [@ciro.raggio](https://discourse.slicer.org/u/ciro.raggio)\
**Post date:** [February 28, 2026, 10:07am UTC](https://discourse.slicer.org/t/install-modalityconverter/46308/5 "2026-02-28T10:07:46Z")

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Hello @jmarichal ,

please try fully restarting 3D Slicer by closing it completely and opening it again. The module will not load until a full restart is performed after the installation process.

If the module is still not visible after restarting, a reliable workaround would be to install the extension directly from the source repository in a few simple steps!

You can clone or download the repository from GitHub: [https://github.com/ciroraggio/SlicerModalityConverter.git](https://github.com/ciroraggio/SlicerModalityConverter.git)

Then, open the “Extension Wizard” in 3D Slicer and import the cloned folder. After installation, please restart Slicer.

In the repository, you will find a README file. **In the “Installation” section, there is also a [short video](https://youtu.be/QsxzjQb05D4?si=3Fa5OmwJHBW9V8aV) showing how to install modules manually** (watch it from 1:21 onwards; the procedure is the same). This workflow is usually intended for users running Slicer versions earlier than 5.9, but it is a valid solution in general and is commonly used during development.

Please note that when installing from source, the extension will not be managed by the Extension Manager as usual, so updates will need to be pulled manually from the repository (i.e. via `git pull`). However, the module will run exactly the same way once installed.

Let me know if this solves the issue.