# Unable to install extension - "Incompatible with Slicer r30110"

**URL:** <https://discourse.slicer.org/t/unable-to-install-extension-incompatible-with-slicer-r30110/19158>\
**Category:** Development\
**Tags:** extensions-manager, bug, radiomics\
**Created:** [August 11, 2021, 6:14pm UTC](https://discourse.slicer.org/t/unable-to-install-extension-incompatible-with-slicer-r30110/19158 "2021-08-11T18:14:01Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [August 11, 2021, 6:14pm UTC](https://discourse.slicer.org/t/unable-to-install-extension-incompatible-with-slicer-r30110/19158/1 "2021-08-11T18:14:01Z")

</div>

I tried and failed to install SlicerRadiomics extension with the current Slicer preview. Is it expected? Sorry if I missed announcements and migration guidelines. I searched, but not sure where I should search - the error is not particularly helpful in informing about how the issue can be remedied.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/5/15acb080d5c1fd2f5e3122a97d397c27e52d6d8c.png)

---

<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [August 11, 2021, 6:20pm UTC](https://discourse.slicer.org/t/unable-to-install-extension-incompatible-with-slicer-r30110/19158/2 "2021-08-11T18:20:28Z")

</div>

Thanks for the report, it is a side effect of [Upcoming downtime for download.slicer.org and extension manager due to package server transition - #3 by jcfr](https://discourse.slicer.org/t/upcoming-downtime-for-download-slicer-org-and-extension-manager-due-to-package-server-transition/17444/3), issue has been identified earlier today and I am currently working on this.

For reference, this is now tracked in [Installed extensions are not loaded · Issue #5786 · Slicer/Slicer · GitHub](https://github.com/Slicer/Slicer/issues/5786)

---

<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [August 13, 2021, 8:03am UTC](https://discourse.slicer.org/t/unable-to-install-extension-incompatible-with-slicer-r30110/19158/3 "2021-08-13T08:03:56Z")

</div>

To follow up, issue has been fixed by the following pull-requests (Slicer \>= `r30117`):

- [BUG: Fix loading of extension installed using "Girder\_v1" serverAPI by jcfr · Pull Request #5790 · Slicer/Slic](https://github.com/Slicer/Slicer/pull/5790)
- [Fix extensions manager issues associated with "Girder\_v1" server API integration by jcfr · Pull Request #5791](https://github.com/Slicer/Slicer/pull/5791)