# How can I download 3D slicer 4.10, I can't load RT file with 3D slicer 4.11 for CT scan

**URL:** <https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904>\
**Category:** Support\
**Tags:** dicom\
**Created:** [September 29, 2021, 1:07am UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904 "2021-09-29T01:07:48Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![KAMONCHAT\_APIVANICHK](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kamonchat_apivanichk/32/10368_2.png) [@KAMONCHAT\_APIVANICHK](https://discourse.slicer.org/u/KAMONCHAT_APIVANICHK)\
**Post date:** [September 29, 2021, 1:07am UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/1 "2021-09-29T01:07:48Z")

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I would like to download older version of 3D slicer, 3D slicer 4.10, instead of 4.11. Newest version can’t be opened my RTSTRUCT file, it ignored my file. I can’t continuously work. How can I down load older version.

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**Author:** ![KAMONCHAT\_APIVANICHK](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kamonchat_apivanichk/32/10368_2.png) [@KAMONCHAT\_APIVANICHK](https://discourse.slicer.org/u/KAMONCHAT_APIVANICHK)\
**Post date:** [September 28, 2021, 3:52pm UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/2 "2021-09-28T15:52:56Z")

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I installed 3D slicer 4.11 but I can’t open any RT structure data. I had opened it with old version. Why?

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**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [September 29, 2021, 2:20am UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/3 "2021-09-29T02:20:50Z")

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Can you upload a log file? (in application menu bar: Help-\>Report a bug).

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**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [September 29, 2021, 2:22am UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/4 "2021-09-29T02:22:22Z")

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Also, do you have SlicerRT installed?

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 29, 2021, 9:21am UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/5 "2021-09-29T09:21:21Z")

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Please download the latest Slicer release, install the SlicerRT extension, open the DICOM module, import the folder containing your dataset and load the whole study from the DICOM browser. Let us know if it works.

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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:** [September 29, 2021, 2:33pm UTC](https://discourse.slicer.org/t/how-can-i-download-3d-slicer-4-10-i-cant-load-rt-file-with-3d-slicer-4-11-for-ct-scan/19904/6 "2021-09-29T14:33:06Z")

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> [@cpinter](#):
>
> open the DICOM module, import the folder containing your dataset and load the whole study from the DICOM browser

See step-by-step instructions [here](https://slicer.readthedocs.io/en/latest/user_guide/modules/dicom.html#read-dicom-files-into-the-scene).