# Cannot download extensions

**URL:** <https://discourse.slicer.org/t/cannot-download-extensions/584>\
**Category:** Support\
**Created:** [June 28, 2017, 2:09am UTC](https://discourse.slicer.org/t/cannot-download-extensions/584 "2017-06-28T02:09:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mksmendoza](https://avatars.discourse-cdn.com/v4/letter/m/67e7ee/32.png) [@mksmendoza](https://discourse.slicer.org/u/mksmendoza)\
**Post date:** [June 28, 2017, 2:09am UTC](https://discourse.slicer.org/t/cannot-download-extensions/584/1 "2017-06-28T02:09:49Z")

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Operating system: Mac OS X  
Slicer version: 4.6 and 4.7  
Expected behaviour: downloadable  
Actual behavior: non-downloadable extensions

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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:** [June 28, 2017, 9:04am UTC](https://discourse.slicer.org/t/cannot-download-extensions/584/2 "2017-06-28T09:04:03Z")

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Probably you are behind a firewall that blocks the Extension Manager. Try to manually download and install the extension using your web browser, as described here: [https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/ExtensionsManager#How\_to\_manually\_download\_an\_extension\_package.3F](https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/ExtensionsManager#How_to_manually_download_an_extension_package.3F)

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**Author:** ![mksmendoza](https://avatars.discourse-cdn.com/v4/letter/m/67e7ee/32.png) [@mksmendoza](https://discourse.slicer.org/u/mksmendoza)\
**Post date:** [June 28, 2017, 5:25pm UTC](https://discourse.slicer.org/t/cannot-download-extensions/584/3 "2017-06-28T17:25:50Z")

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Thank you for the help. I was able to download the extensions now.