# How to install "parallelprocessing extension"?

**URL:** <https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456>\
**Category:** Support\
**Tags:** segmentation, extensions-manager\
**Created:** [November 2, 2021, 12:34pm UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456 "2021-11-02T12:34:49Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![BARNEY](https://avatars.discourse-cdn.com/v4/letter/b/48db29/32.png) [@BARNEY](https://discourse.slicer.org/u/BARNEY)\
**Post date:** [November 2, 2021, 12:34pm UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456/1 "2021-11-02T12:34:49Z")

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Operating system: Mac os and Win10.  
Slicer version: 4.11.20210225.  
Expected behavior: Install “Segmentation UNet module” correctly.  
Actual behavior:

 ![截屏2021-11-02 下午5.24.16](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/5/a540542d72870c2741941230adb48adbb7421abf.png)  
Pop-up window says to install the paralleprocessing extension, but there’s no right item in Slicer Manager. Thank you if you have the solution！

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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:** [November 2, 2021, 1:06pm UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456/2 "2021-11-02T13:06:19Z")

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That extension is available for the current nightly build. It’s relatively new and I don’t believe we ever made it available for the release.

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**Author:** ![sadaf\_hajiha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sadaf_hajiha/32/13615_2.png) [@sadaf\_hajiha](https://discourse.slicer.org/u/sadaf_hajiha)\
**Post date:** [December 22, 2021, 11:35am UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456/3 "2021-12-22T11:35:26Z")

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Hello. I see in a YouTube video that ParallelProcessing extension is available to install for the latest preview version (14.3.0), however, I cannot find it in this preview version on Mac. Could you please help?

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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:** [December 22, 2021, 2:54pm UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456/4 "2021-12-22T14:54:34Z")

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The extension is available for recent Slicer Preview Releases:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/3/b3cd4b2865bbec9c3d486d97a1b3732b20c74c9e.png)

You can see here that is also available for macOS: [https://extensions.slicer.org/catalog/All/30509/macosx?q=paral](https://extensions.slicer.org/catalog/All/30509/macosx?q=paral)

Maybe these tips will help: [Extensions Manager — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/extensions_manager.html#extension-is-not-found-for-current-slicer-version)

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**Author:** ![BARNEY](https://avatars.discourse-cdn.com/v4/letter/b/48db29/32.png) [@BARNEY](https://discourse.slicer.org/u/BARNEY)\
**Post date:** [January 3, 2022, 9:07am UTC](https://discourse.slicer.org/t/how-to-install-parallelprocessing-extension/20456/5 "2022-01-03T09:07:53Z")

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Thank you! Happy New year!