# How to install extensions from past versions of 3D slicer

**URL:** <https://discourse.slicer.org/t/how-to-install-extensions-from-past-versions-of-3d-slicer/23994>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [June 21, 2022, 11:40pm UTC](https://discourse.slicer.org/t/how-to-install-extensions-from-past-versions-of-3d-slicer/23994 "2022-06-21T23:40:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![spencer.t.brinker](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@spencer.t.brinker](https://discourse.slicer.org/u/spencer.t.brinker)\
**Post date:** [June 21, 2022, 11:40pm UTC](https://discourse.slicer.org/t/how-to-install-extensions-from-past-versions-of-3d-slicer/23994/1 "2022-06-21T23:40:54Z")

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I have Slicer-4.8.0-win-amd64 on a windows 10 system. I can no longer interface the extension-manager. I have a very specific hierarchy design in a human trial and need to keep version 4.8.0 running on a new computer but I can not get Sequences or SlicerIGT extensions for some reason. Are these extensions available still for Slicer-4.8.0 via hard disk?

The expertise in my group is no longer avialble to redesgikn the hierarchy in the newest version of 3D slicer.

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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 21, 2022, 11:59pm UTC](https://discourse.slicer.org/t/how-to-install-extensions-from-past-versions-of-3d-slicer/23994/2 "2022-06-21T23:59:10Z")

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See instructions how to download old releases of Slicer and extensions for it [here](https://www.slicer.org/wiki/Documentation/Nightly/FAQ/General#Where_can_I_download_older_release_of_Slicer_.3F). You can install a downloaded extension package by selecting `Install from File` from the tools menu in the Extensions Manager.

@jcfr As far as I remember, you implemented a backward compatibility layer in the new extensions server. Isn’t it supposed to make extensions manager work in Slicer-4.8?