# Unable to install LesionSpotlight Extension

**URL:** <https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [October 5, 2021, 12:15pm UTC](https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018 "2021-10-05T12:15:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Johannes](https://avatars.discourse-cdn.com/v4/letter/j/7ba0ec/32.png) [@Johannes](https://discourse.slicer.org/u/Johannes)\
**Post date:** [October 5, 2021, 12:15pm UTC](https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018/1 "2021-10-05T12:15:25Z")

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Hello everyone,

I want to install the LesionSpotlight slicer extension. But I can’t find this by searching in the Extension Manager.  
Link to extension: [Documentation/Nightly/Extensions/LesionSpotlight - Slicer Wiki](https://www.slicer.org/wiki/Documentation/Nightly/Extensions/LesionSpotlight)

I use MacOS and the slicer version 4.13.0-2021-10-03 r30282 / 04d69cd

I’ve tried other versions of Slicer but can’t find the extension there either.

Is there a way to manually install this through Slicer’s GUI?

Warm greetings

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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:** [October 5, 2021, 4:16pm UTC](https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018/2 "2021-10-05T16:16:31Z")

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This extension fails to build on recent Slicer versions due to a [small syntax error](https://slicer.cdash.org/viewBuildError.php?buildid=2425037) (probably introduces by Slicer core software build tools or library updates).

The maintainers of the extension should be able to fix the problem easily, so please ask them first by [submitting an issue in their tracker](https://github.com/CSIM-Toolkits/LesionSpotlightExtension/issues).

If they don’t respond within 1-2 weeks then let us know here and we’ll see if Slicer core developers can fix the issue.

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**Author:** ![Johannes](https://avatars.discourse-cdn.com/v4/letter/j/7ba0ec/32.png) [@Johannes](https://discourse.slicer.org/u/Johannes)\
**Post date:** [October 8, 2021, 8:26am UTC](https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018/3 "2021-10-08T08:26:26Z")

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Thank you so much. I reported the error to their tracker … I will inform you, if they remedy/repair the code.

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**Author:** ![Johannes](https://avatars.discourse-cdn.com/v4/letter/j/7ba0ec/32.png) [@Johannes](https://discourse.slicer.org/u/Johannes)\
**Post date:** [October 25, 2021, 7:21am UTC](https://discourse.slicer.org/t/unable-to-install-lesionspotlight-extension/20018/4 "2021-10-25T07:21:46Z")

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Unfortunately, none of the LesionSpotlightExtension team responded. You mentioned, that maybe the core development team can fix this issue.