# Extension Manager install/download error (not finding extension id)

**URL:** <https://discourse.slicer.org/t/extension-manager-install-download-error-not-finding-extension-id/40384>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [November 26, 2024, 2:55pm UTC](https://discourse.slicer.org/t/extension-manager-install-download-error-not-finding-extension-id/40384 "2024-11-26T14:55:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![acsenrafilho](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/acsenrafilho/32/6217_2.png) [@acsenrafilho](https://discourse.slicer.org/u/acsenrafilho)\
**Post date:** [November 26, 2024, 2:55pm UTC](https://discourse.slicer.org/t/extension-manager-install-download-error-not-finding-extension-id/40384/1 "2024-11-26T14:55:43Z")

</div>

Hi Slicers,

I have updated the Slicer Extension Index to contain the support for `5.6` extension version.  
My extension is: [https://slicer.cdash.org/builds/3603576](https://slicer.cdash.org/builds/3603576) (for Linux build)

I checked that the CDash report have built correctly all version (Win, Mac and Linux), showing the packing symbol on it and referencing to the correct git commit hash.

However, I have tested installing it on Slicer (user installation, 5.6.2 r32448 / f10cd8c), just to be sure everything is ok. The Extension Index shows my extension in the list, by searching `Diffusion Complexity`, but when I click to install it an error pops up on the screen:

```auto
Download of extension failed, could not find an extension with id = 6745a15376aed8e33340f5c6

```

What happens here? I do not know what went wrong here…  
Is this the correct way to inform a extension to be available to a Slicer stable version?  
I found confusing that is citing in the CDash build information that Slicer is at `Type: Extensions-5.6-Nightly`.