# Can't install Osteotomy Planner extension

**URL:** <https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149>\
**Category:** Support\
**Created:** [February 23, 2021, 2:11am UTC](https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149 "2021-02-23T02:11:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![skylar](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/skylar/32/10040_2.png) [@skylar](https://discourse.slicer.org/u/skylar)\
**Post date:** [February 23, 2021, 2:11am UTC](https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149/1 "2021-02-23T02:11:17Z")

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Operating system: Windows 10 19042  
Slicer version: 4.11.20200930  
Expected behavior: [Find extension in Extension Manager](https://github.com/KitwareMedical/OsteotomyPlanner/wiki/Installation)  
Actual behavior: Extension Manager does not show Osteotomy Planner extension

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**Author:** ![manjula](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/manjula/32/80981_2.png) [@manjula](https://discourse.slicer.org/u/manjula)\
**Post date:** [February 23, 2021, 6:22am UTC](https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149/2 "2021-02-23T06:22:57Z")

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I think Dynamic Modeler that comes by default in recent releases of 3D Slicer pretty much do everything that the osteotomy planner does

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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:** [February 23, 2021, 7:16pm UTC](https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149/3 "2021-02-23T19:16:54Z")

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@Sam_Horvath is working on reviving the Osteotomy Planner extension, so that it keep high-level features of the planner module but uses Dynamic Modeler module internally. Until this rework is completed (no ETA, as it is a low priority task), Dynamic Modeler module can be used.

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**Author:** ![manjula](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/manjula/32/80981_2.png) [@manjula](https://discourse.slicer.org/u/manjula)\
**Post date:** [February 25, 2021, 5:47am UTC](https://discourse.slicer.org/t/cant-install-osteotomy-planner-extension/16149/4 "2021-02-25T05:47:38Z")

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Is there a way to implement the Bending of models part with two fiducial points at the moment?

I tried the thinkspline transformation and it is too complex for me for daily use and results are not predictable.