# Extensions Download fails?
**URL:** https://discourse.slicer.org/t/extensions-download-fails/155
**Category:** Support
**Created:** [April 20, 2017, 8:15pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155 "2017-04-20T20:15:07Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@fedorov](https://discourse.slicer.org/u/fedorov)
#### Post date: [April 20, 2017, 8:15pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/1 "2017-04-20T20:15:07Z")
Question asked by Matias Montroull on slicer-user list:
Hi,
I’m trying to download an extension using the extension manager but I get an error saying the download failed.
## When I go to [@KitwareMedical/slicer-extensions-webapp](http://slicer.kitware.com/midas3/slicerappstore) I can’t see ANY extension to download, it comes up with: No Extensions Found. Am I in the right page? pasted1
Matias
---
### Author:  [@fedorov](https://discourse.slicer.org/u/fedorov)
#### Post date: [April 20, 2017, 8:17pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/2 "2017-04-20T20:17:33Z")
Matias,
We are not building extensions for 32 bit platforms, and it appears from your screenshot that is what you are looking at.
Let us know if you have troubles downloading extensions for 64 bit platforms.
AF
---
### Author:  [@hina-shah](https://discourse.slicer.org/u/hina-shah)
#### Post date: [April 20, 2017, 8:24pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/3 "2017-04-20T20:24:37Z")
HI Matias,
You will also need a correct revision number to see the list of extensions. (as seen on [download.slicer.org](http://download.slicer.org):
.
Are you trying to populate the extensions list in an installed version of slicer or a built one? If you’re trying to get extensions on a built version of slicer you need to get the git-hash for the nightly revision number: `git svn find-rev r25938` (for example), and then checkout the branch with that hash.
Hope this helps!
Hina
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [April 20, 2017, 8:35pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/4 "2017-04-20T20:35:56Z")
Unfortunately the default app store link never shows anything because you
need to switch to 64bit and specify a revision number.
Here are links to see extensions for the 4.6.2 builds on Mac and Windows:
[http://slicer.kitware.com/midas3/slicerappstore?layout=empty&os=macosx&arch=amd64&revision=25516](http://slicer.kitware.com/midas3/slicerappstore?layout=empty&os=macosx&arch=amd64&revision=25516)
[http://slicer.kitware.com/midas3/slicerappstore?layout=empty&os=win&arch=amd64&revision=25516](http://slicer.kitware.com/midas3/slicerappstore?layout=empty&os=win&arch=amd64&revision=25516)
If you see these, but the download fails inside slicer then the issue may
lie elsewhere. Did you look in the error log?
---
### Author:  [@Matias\_Montroull](https://discourse.slicer.org/u/Matias_Montroull)
#### Post date: [April 20, 2017, 8:55pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/5 "2017-04-20T20:55:19Z")
Hi Fedorov, I changed to 64 bits and still I can’t see anything…
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### Author:  [@Matias\_Montroull](https://discourse.slicer.org/u/Matias_Montroull)
#### Post date: [April 20, 2017, 8:56pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/6 "2017-04-20T20:56:07Z")
Thanks, I’m trying to populate in an installed version of Slicer in a Windows 64 bits machine,
---
### Author:  [@Matias\_Montroull](https://discourse.slicer.org/u/Matias_Montroull)
#### Post date: [April 20, 2017, 8:58pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/7 "2017-04-20T20:58:37Z")
Thanks Pieper, I went to the links you shared and was able to download the extension and install it. Now, I’m curious why it wouldn’t let me install in the Slicer app itself…
This is in the error log:
“Failed downloading: [http://slicer.kitware.com/midas3/download?items=259272](http://slicer.kitware.com/midas3/download?items=259272)”
---
### Author:  [@fedorov](https://discourse.slicer.org/u/fedorov)
#### Post date: [April 20, 2017, 9:00pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/8 "2017-04-20T21:00:50Z")
@Matias_Montroull, following the link you included, it looks like a problem on the server
I think @jcfr is the only person who can answer what is happening.
---
### Author:  [@jcfr](https://discourse.slicer.org/u/jcfr)
#### Post date: [April 21, 2017, 3:53pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/9 "2017-04-21T15:53:07Z")
> [@Matias\_Montroull](#):
>
> Thanks Pieper, I went to the links you shared and was able to download the extension and install it. Now, I’m curious why it wouldn’t let me install in the Slicer app itself..
>
> This is in the error log:
> "Failed downloading: [http://slicer.kitware.com/midas3/download?items=259272](http://slicer.kitware.com/midas3/download?items=259272)
Hi @Matias_Montroull,
### Short version:
Install Slicer 4.6.2 , extensions are expected to be available.
### Long version
The link you provided corresponds to extension `25441-win-amd64-SkullStripper-git280121d-2015-01-12.zip` which is associated with Slicer r25441 and corresponds to Slicer 4.6.0. This can be seen using these links:
- [http://slicer.kitware.com/midas3/item/259272](http://slicer.kitware.com/midas3/item/259272)
- [Release Details - Slicer Wiki](https://www.slicer.org/wiki/Release_Details)
I would suggest to download the latest “stable” version `4.6.2` here: [http://download.slicer.org](http://download.slicer.org) (which is associated with `r25516`)
### Slicer AppStore from the web
Using this link: [@KitwareMedical/slicer-extensions-webapp](http://slicer.kitware.com/midas3/slicerappstore) will allow to enter revision number and also select the expected platform and arch.
(Note that the `layout=empty&` is not present in this link)
---
### Author:  [@JohnK](https://discourse.slicer.org/u/JohnK)
#### Post date: [November 28, 2017, 12:48am UTC](https://discourse.slicer.org/t/extensions-download-fails/155/10 "2017-11-28T00:48:59Z")
Hi, I am using 3DSlicer version 4.9.0 on Windows 7-64bit
- In Install Extensions tab I get an access error:
“you must be authenticed to acces this URL…”
(I registered and logged into kitware with my own account to be sure)
-Went to [http://slicer.kitware.com/midas3/item/261265](http://slicer.kitware.com/midas3/item/261265)
to manually download the DMRI plugin
now I get the same error posted earlier:
**An error occurred**
**The system has encountered the following error:**
**Unable to find file on the disk**
**In /projects/src/Midas3/core/controllers/components/DownloadBitstreamComponent.php, line: 45**
etc.
Should I revert to an older version or what might be my problem? Thanks,
John
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [November 28, 2017, 1:20am UTC](https://discourse.slicer.org/t/extensions-download-fails/155/11 "2017-11-28T01:20:59Z")
> [@JohnK](#):
>
> 3DSlicer version 4.9.0
Extension packages for nightly versions may be cleaned up to conserve disk space. Download the latest nightly build of Slicer (as of now, 26654) - the extension package is available for this build ([@KitwareMedical/slicer-extensions-webapp](http://slicer.kitware.com/midas3/slicerappstore/extension/view?extensionId=197038&layout=layout)).
Slicer app store does not require you to log in for downloading packages. The error that you got (“you must be authenticed to acces this URL…”) is most likely is a message from your hospital/corporate firewall.
---
### Author:  [@JohnK](https://discourse.slicer.org/u/JohnK)
#### Post date: [November 28, 2017, 6:24pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/12 "2017-11-28T18:24:56Z")
Yes, the new version (26654) will work with the manual install plugin (no dialog box to let you know it is done though). FYI, there is a windows console window present (I assume this is now default or a debugging component?). Now always on exit of 3D slicer I get a memory leak error the log is:
```auto
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkSlicerTractographyInteractiveSeedingLogic
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkSlicerFiberBundleLogic
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLFiberBundleNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLFiberBundleLineDisplayNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkPolyDataColorLinesByOrientation
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkPolyDataTensorToColor
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLFiberBundleTubeDisplayNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkPolyDataTensorToColor
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkPolyDataColorLinesByOrientation
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLFiberBundleGlyphDisplayNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLFiberBundleStorageNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkMRMLTractographyInteractiveSeedingNode
Generic Warning: In C:\D\N\Slicer-0-build\VTKv9\Common\Core\vtkDebugLeaks.cxx, line 281
Deleting unknown object: vtkTractographyDisplayMRMLDMObjectFactory
```
---
### Author:  [@ihnorton](https://discourse.slicer.org/u/ihnorton)
#### Post date: [November 28, 2017, 7:04pm UTC](https://discourse.slicer.org/t/extensions-download-fails/155/13 "2017-11-28T19:04:16Z")
Thanks for the report. I’ll take a look at the leak warnings.