# Download sample data not working

**URL:** <https://discourse.slicer.org/t/download-sample-data-not-working/45114>\
**Category:** Support\
**Created:** [November 17, 2025, 12:21pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114 "2025-11-17T12:21:02Z")\
**Posts on this page:** 11\
**Page:** 1

<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [November 17, 2025, 12:21pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/1 "2025-11-17T12:21:02Z")

</div>

Hi all,  
I tried to download some sample data by using the dedicated extension but it keeps downloading and no data is loaded.

Paolo

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<div class="post-metadata">

**Author:** ![Andinet\_Enquobahrie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/andinet_enquobahrie/32/75_2.png) [@Andinet\_Enquobahrie](https://discourse.slicer.org/u/Andinet_Enquobahrie)\
**Post date:** [November 17, 2025, 7:33pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/2 "2025-11-17T19:33:51Z")

</div>

Could you please let us know which Slicer version you are using and which operating system?

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<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [November 17, 2025, 10:44pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/3 "2025-11-17T22:44:45Z")

</div>

Stable version (5.10.0) on Linux.

I get these messages in the python console

> [VTK] vtkMRMLModelStorageNode::ReadDataInternal: Failed to load model: unrecognized file extension ‘.gipl.gz’ of file ‘/home/p4ol0/.cache/slicer.org/Slicer/SlicerIO/PreDentalSurgery.gipl.gz’.
> 
> [VTK] vtkMRMLStorageNode::ReadData: Failed to read node (null) ((null)) from filename=‘/home/p4ol0/.cache/slicer.org/Slicer/SlicerIO/PreDentalSurgery.gipl.gz’
> 
> [VTK] Couldn’t read file, returning null fiberBundle node: /home/p4ol0/.cache/slicer.org/Slicer/SlicerIO/PreDentalSurgery.gipl.gz
> 
> [Python] Load failed!
> 
> [Python] Load failed (attempt 1 of 3)…

I think the same happens for the preview.

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<div class="post-metadata">

**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [November 17, 2025, 10:55pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/4 "2025-11-17T22:55:11Z")

</div>

Is this your custom build or the installer? I can’t replicate this is on Linux using standard package from [download.slicer.org](http://download.slicer.org).

```auto
Requesting download PreDentalSurgery.gipl.gz from https://github.com/Slicer/SlicerTestingData/releases/download/SHA256/7bfa16945629c319a439f414cfb7edddd2a97ba97753e12eede3b56a0eb09968 ...
Downloaded 2.4 MB (10% of 23.6 MB)...
Downloaded 4.7 MB (20% of 23.6 MB)...
Downloaded 7.1 MB (30% of 23.6 MB)...
Downloaded 9.5 MB (40% of 23.6 MB)...
Downloaded 11.8 MB (50% of 23.6 MB)...
Downloaded 14.2 MB (60% of 23.6 MB)...
Downloaded 16.5 MB (70% of 23.6 MB)...
Downloaded 18.9 MB (80% of 23.6 MB)...
Downloaded 21.3 MB (90% of 23.6 MB)...
Downloaded 23.6 MB (100% of 23.6 MB)...
Download finished
Verifying checksum
Checksum OK
Requesting load PreDentalSurgery from /home/exouser/.cache/slicer.org/Slicer/SlicerIO/PreDentalSurgery.gipl.gz ...
"Volume" Reader has successfully read the file "/home/exouser/.cache/slicer.org/Slicer/SlicerIO/PreDentalSurgery.gipl.gz" "[0.28s]"
Load finished

Requesting download PostDentalSurgery.gipl.gz from https://github.com/Slicer/SlicerTestingData/releases/download/SHA256/4cdc3dc35519bb57daeef4e5df89c00849750e778809e94971d3876f95cc7bbd ...
Downloaded 3.4 MB (10% of 33.8 MB)...
Downloaded 6.8 MB (20% of 33.8 MB)...
Downloaded 10.1 MB (30% of 33.8 MB)...
Downloaded 13.5 MB (40% of 33.8 MB)...
Downloaded 16.9 MB (50% of 33.8 MB)...
Downloaded 20.3 MB (60% of 33.8 MB)...
Downloaded 23.6 MB (70% of 33.8 MB)...
Downloaded 27.0 MB (80% of 33.8 MB)...
Downloaded 30.4 MB (90% of 33.8 MB)...
Downloaded 33.8 MB (100% of 33.8 MB)...
Download finished
Verifying checksum
Checksum OK
Requesting load PostDentalSurgery from /home/exouser/.cache/slicer.org/Slicer/SlicerIO/PostDentalSurgery.gipl.gz ...
"Volume" Reader has successfully read the file "/home/exouser/.cache/slicer.org/Slicer/SlicerIO/PostDentalSurgery.gipl.gz" "[0.29s]"
Load finished

```

If you are custom building, did you any chance turn off gipl support off in ITK?

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<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [November 17, 2025, 11:07pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/5 "2025-11-17T23:07:26Z")

</div>

I’m using the build available on the website.

I’m on Arch Linux

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<div class="post-metadata">

**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:** [November 17, 2025, 11:26pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/6 "2025-11-17T23:26:19Z")

</div>

Can tou load other data sets that are not in gipl.gz file format?

Have you installed any extensions or Python packages? (maybe your ITK IO classes have been overwritten)

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<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [January 5, 2026, 4:42pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/7 "2026-01-05T16:42:15Z")

</div>

Sorry for the huge delay.

I noticed I have problems only with the CBCTDentalSurgery dataset.

Paolo

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<div class="post-metadata">

**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:** [January 5, 2026, 10:36pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/8 "2026-01-05T22:36:21Z")

</div>

CBCTDentalSurgery uses the very rare .gipl.gz file format, so your ITK might not have been built without support it. Which Slicer version is this? Have you built it yourself?

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<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [January 6, 2026, 10:46pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/9 "2026-01-06T22:46:44Z")

</div>

I am using the binaries downloaded from website (Linux OS).

I just noticed that if I use fresh-new slicer it works, so now I’m trying to figure out if it is something related to the installation of some extension (and if so wich one)

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<div class="post-metadata">

**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:** [January 12, 2026, 5:41pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/10 "2026-01-12T17:41:26Z")

</div>

Does the image reading break if you `pip_install('SimpleITK')`?

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<div class="post-metadata">

**Author:** ![PaoloZaffino](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paolozaffino/32/81052_2.png) [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\
**Post date:** [January 18, 2026, 2:45pm UTC](https://discourse.slicer.org/t/download-sample-data-not-working/45114/11 "2026-01-18T14:45:17Z")

</div>

No, if I force to reinstall SimpleITK it works.

If I install TotalSegmentator and DentalSegmentator it got the problem.

If I install TotalSegmentator or DentalSegmentator, the sample data works well.