# Can't install extensions in latest Preview Release

**URL:** <https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [June 29, 2020, 9:22pm UTC](https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285 "2020-06-29T21:22:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![BennetMontgomery](https://avatars.discourse-cdn.com/v4/letter/b/c2a13f/32.png) [@BennetMontgomery](https://discourse.slicer.org/u/BennetMontgomery)\
**Post date:** [June 29, 2020, 9:22pm UTC](https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285/1 "2020-06-29T21:22:56Z")

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I installed the latest preview build today and went to reinstall the extensions I was using, but Slicer claimed that the extensions were incompatible with the current version. Do I just need to downgrade to a version compatible with the extensions I want, or is something else wrong here?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/6/067681a9c1276fad3895eb2e2013c4bd8d51e49c.png)

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**Author:** ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Post date:** [June 30, 2020, 1:17am UTC](https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285/2 "2020-06-30T01:17:11Z")

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Something else I think. I recommend trying an earlier version for now, we have been in the midst of some SSL updates and I think this is related to that.

@jcfr I am getting this error on the most recent Windows nightly when I try to download extensions:

```auto
"Retrieving extension metadata [extensionId: 381453]"
"{5c738122-c1f4-4c42-a591-0e4cbe6ae535}: 99: Network access is disabled."
"Failed to retrieve metadata for extension 381453"

```

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<div class="post-metadata">

**Author:** ![BennetMontgomery](https://avatars.discourse-cdn.com/v4/letter/b/c2a13f/32.png) [@BennetMontgomery](https://discourse.slicer.org/u/BennetMontgomery)\
**Post date:** [June 30, 2020, 2:51pm UTC](https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285/3 "2020-06-30T14:51:16Z")

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It turns out the solution was just to wait. I guess the extensions server was overloaded or something similar. After a while, I was able to access the extensions menu again and download what I needed.

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**Author:** ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Post date:** [June 30, 2020, 2:57pm UTC](https://discourse.slicer.org/t/cant-install-extensions-in-latest-preview-release/12285/4 "2020-06-30T14:57:51Z")

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Yes, we are actively working on replacing the current extension server which is definitely having issues.