# Unable to view rt struct even after installing slicerRT extension

**URL:** <https://discourse.slicer.org/t/unable-to-view-rt-struct-even-after-installing-slicerrt-extension/29527>\
**Category:** Support\
**Tags:** extensions-manager, slicerrt, extensions\
**Created:** [May 18, 2023, 7:29am UTC](https://discourse.slicer.org/t/unable-to-view-rt-struct-even-after-installing-slicerrt-extension/29527 "2023-05-18T07:29:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anonymous007](https://avatars.discourse-cdn.com/v4/letter/a/b77776/32.png) [@Anonymous007](https://discourse.slicer.org/u/Anonymous007)\
**Post date:** [May 18, 2023, 7:29am UTC](https://discourse.slicer.org/t/unable-to-view-rt-struct-even-after-installing-slicerrt-extension/29527/1 "2023-05-18T07:29:07Z")

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I was trying to install slicerRT extension using extension manager. But it was giving this error.

 ![Screenshot (380)](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/5/05c1686491d8852024ce75e711b0e77bb4b04548.png)

Then I installed the extension manually from a file [https://slicer-packages.kitware.com/api/v1/item/62c80d5caa08d161a319bcd6/download](https://slicer-packages.kitware.com/api/v1/item/62c80d5caa08d161a319bcd6/download)

 ![Screenshot (384)](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/3/e31b144d320ba640bb70d84ddd1fd660bd99ee00.png)

But I’m still getting this while viewing my RT- Struct in slicer.

 ![ext](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/3/134245c75693c030bcec5896e1c3e42d60f816b6.png)

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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:** [May 18, 2023, 7:07pm UTC](https://discourse.slicer.org/t/unable-to-view-rt-struct-even-after-installing-slicerrt-extension/29527/2 "2023-05-18T19:07:49Z")

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You have downloaded an extension for Slicer revision 30893 (Slicer 5.0.3). Please use the latest Slicer Stable Release (or the latest Slicer Preview Release if there is a specific fix or new feature you need) and let us know if you encounter any problems.