# SlicerRT extension installation

**URL:** <https://discourse.slicer.org/t/slicerrt-extension-installation/22497>\
**Category:** Support\
**Created:** [March 14, 2022, 3:58pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497 "2022-03-14T15:58:18Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Yarden](https://avatars.discourse-cdn.com/v4/letter/y/f6c823/32.png) [@Yarden](https://discourse.slicer.org/u/Yarden)\
**Post date:** [March 14, 2022, 3:58pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/1 "2022-03-14T15:58:18Z")

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Hi,  
I wanted to install the slicerRT extension but the extension tab seems empty. Tried to solve it with no success.  
I saw there is an option to add an extension file externally so i could upload it to 3d slicer as an archive file.

Is there a file for this extension to download? Or any other advices…?

Thanks!

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [March 14, 2022, 4:16pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/2 "2022-03-14T16:16:52Z")

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SlicerRT extension is currently not available for latest Slicer Preview Release on Linux and macOS due to a build error. A fix is in the works, the extension should be available again within 1-2 days:

> <https://github.com/SlicerRt/SlicerRT/pull/207>
>
> Plastimatch \[PR\](https://gitlab.com/plastimatch/plastimatch/-/merge\_requests/29)… must be merged before this PR.

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**Author:** ![Yarden](https://avatars.discourse-cdn.com/v4/letter/y/f6c823/32.png) [@Yarden](https://discourse.slicer.org/u/Yarden)\
**Post date:** [March 15, 2022, 1:15pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/3 "2022-03-15T13:15:04Z")

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Thanks for your reply.  
I’m on Windows. I downloaded the master from the link you sent and tried to upload the zip as an external archive file but got the error message “no extension description found in archive…”  
I’ll be happy to know how to upload the zip OR to solve the issue with the install extensions that is empty. Or if there is another way to succeed in installing the slicerRT extension…

Thanks!

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**Author:** ![Mik](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@Mik](https://discourse.slicer.org/u/Mik)\
**Post date:** [March 15, 2022, 5:32pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/4 "2022-03-15T17:32:28Z")

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Try to install recent Slicer Preview. SlicerRT extension should be available to install from extension browser.

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**Author:** ![Yarden](https://avatars.discourse-cdn.com/v4/letter/y/f6c823/32.png) [@Yarden](https://discourse.slicer.org/u/Yarden)\
**Post date:** [March 16, 2022, 1:15pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/5 "2022-03-16T13:15:35Z")

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I have the latest stable release 4.11.20210226.  
Should it work on the preview release 4.13.0? I saw in another post that this version also has this problem that the extension browser is empty…

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**Author:** ![Mik](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@Mik](https://discourse.slicer.org/u/Mik)\
**Post date:** [March 16, 2022, 1:38pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/6 "2022-03-16T13:38:22Z")

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Please, download the latest preview release-4.13.0, for example 2022-03-15.

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<div class="post-metadata">

**Author:** ![Yarden](https://avatars.discourse-cdn.com/v4/letter/y/f6c823/32.png) [@Yarden](https://discourse.slicer.org/u/Yarden)\
**Post date:** [March 21, 2022, 2:35pm UTC](https://discourse.slicer.org/t/slicerrt-extension-installation/22497/7 "2022-03-21T14:35:42Z")

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Thanks!  
The problem was that my network at work block some websites. In the 4.13.0 release there was an option to allow anyways, and then I could see all the extensions to download.