# UKFTractography not supported in newest release

**URL:** <https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667>\
**Category:** Support\
**Created:** [February 13, 2025, 3:33am UTC](https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667 "2025-02-13T03:33:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![fraslau](https://avatars.discourse-cdn.com/v4/letter/f/e47c2d/32.png) [@fraslau](https://discourse.slicer.org/u/fraslau)\
**Post date:** [February 13, 2025, 3:33am UTC](https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667/1 "2025-02-13T03:33:17Z")

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The currently newest stable release 5.8.0 and preview release 5.9.0 for Windows do not support UKFTractography. I downloaded both versions and then downloaded extension SlicerDMRI, but I get the following error message: “slicerDMRI depends on the following extensions, which could not be found.” And there is no UKFTractography extension available.

However, I tried the older release 5.6.2 and this one has both SlicerDMRI and UKFTractography extensions.

Hopefully the new releases can be fixed.

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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 13, 2025, 7:42pm UTC](https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667/2 "2025-02-13T19:42:45Z")

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I pinged some of the developers of the extension in another post but they have been unresponsive so far.

> [@UKF Tractography extension missing in 3D Slicer 5.8.0](https://discourse.slicer.org/t/ukf-tractography-extension-missing-in-3d-slicer-5-8-0/41516/2):
>
> cc: @tbillah @zhangfanmark

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [February 13, 2025, 7:54pm UTC](https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667/3 "2025-02-13T19:54:42Z")

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As it happens I just proposed a fix earlier today: [COMP: fixes for Slicer 5.8 (cxx 17) by pieper · Pull Request #165 · pnlbwh/ukftractography · GitHub](https://github.com/pnlbwh/ukftractography/pull/165)

If all goes well it should be in the stable and preview extensions in the next day or so.

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [February 14, 2025, 3:54pm UTC](https://discourse.slicer.org/t/ukftractography-not-supported-in-newest-release/41667/4 "2025-02-14T15:54:07Z")

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Looks like UKF is working again. It would be great if people could test and report back if there are any issues. @fraslau