# Difference between slicer 4.5 to slicer 4.13
**URL:** https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806
**Category:** Support
**Created:** [September 22, 2021, 12:40pm UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806 "2021-09-22T12:40:15Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Mahesh\_Timmanagoudar](https://discourse.slicer.org/u/Mahesh_Timmanagoudar)
#### Post date: [September 22, 2021, 12:40pm UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/1 "2021-09-22T12:40:15Z")
What are major feature are improved in Slicer 4.5 old version to Slicer 4.13.
I understand some performance improvement is there in 4.13. We can see segmentation improvement and GUI improvements.
May I know any other feature improvement in slicer 4.13 from 4.5?
Where i can see the documents for this?
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### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [September 22, 2021, 12:53pm UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/2 "2021-09-22T12:53:09Z")
Short answer is that a lot of things have been fixed and improved since 4.5.
You can look in detail here (over 4,400 files changed).
> **[Comparing v4.5.0-1...master · Slicer/Slicer](https://github.com/Slicer/Slicer/compare/v4.5.0-1...master)**
>
> Multi-platform, free open source software for visualization and image computing. - Comparing v4.5.0-1...master · Slicer/Slicer
I think anyone used to using 4.5 would be pleasantly surprised by the latest versions but if there are specific regressions let us know.
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### Author:  [@Mahesh\_Timmanagoudar](https://discourse.slicer.org/u/Mahesh_Timmanagoudar)
#### Post date: [September 22, 2021, 2:22pm UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/3 "2021-09-22T14:22:12Z")
Thanks for the reply. Is support available for slicer 4.5 version?
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### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [September 22, 2021, 6:01pm UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/4 "2021-09-22T18:01:50Z")
> [@Mahesh\_Timmanagoudar](#):
>
> Is support available for slicer 4.5 version?
Not really, no. We might be able to answer questions about how it worked, but certainly nobody is providing bug fixes.
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 23, 2021, 1:01am UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/5 "2021-09-23T01:01:50Z")
You may contact [Slicer commercial partners](https://www.slicer.org/commercial-use.html#commercial-partners) for paid support of old releases.
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### Author:  [@Mahesh\_Timmanagoudar](https://discourse.slicer.org/u/Mahesh_Timmanagoudar)
#### Post date: [September 24, 2021, 6:06am UTC](https://discourse.slicer.org/t/difference-between-slicer-4-5-to-slicer-4-13/19806/6 "2021-09-24T06:06:39Z")
Thanks for the reply.