# Orthovoltage dose engine not available in 4.10.2

**URL:** <https://discourse.slicer.org/t/orthovoltage-dose-engine-not-available-in-4-10-2/11959>\
**Category:** Support\
**Tags:** slicerrt\
**Created:** [June 9, 2020, 4:06pm UTC](https://discourse.slicer.org/t/orthovoltage-dose-engine-not-available-in-4-10-2/11959 "2020-06-09T16:06:37Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![annigilus](https://avatars.discourse-cdn.com/v4/letter/a/6a8cbe/32.png) [@annigilus](https://discourse.slicer.org/u/annigilus)\
**Post date:** [June 9, 2020, 4:06pm UTC](https://discourse.slicer.org/t/orthovoltage-dose-engine-not-available-in-4-10-2/11959/1 "2020-06-09T16:06:37Z")

</div>

Greetings! Tell me, please, how can I change Dose engine in External Beam Planning according to it’s tutorial if I don’t have Orthovoltage option in use. Although I installed EGSnrc as it was said.  
Thank you!  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/0/b066610452c7909a8f2b4a49acc0fcdc5f6a22a5.png)

---

<div class="post-metadata">

**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [June 9, 2020, 4:12pm UTC](https://discourse.slicer.org/t/orthovoltage-dose-engine-not-available-in-4-10-2/11959/2 "2020-06-09T16:12:43Z")

</div>

The Orthovoltage dose engine is not available in the current stable release (4.10.2). Try installing the latest preview release (4.11.0).

---

<div class="post-metadata">

**Author:** ![annigilus](https://avatars.discourse-cdn.com/v4/letter/a/6a8cbe/32.png) [@annigilus](https://discourse.slicer.org/u/annigilus)\
**Post date:** [June 9, 2020, 5:18pm UTC](https://discourse.slicer.org/t/orthovoltage-dose-engine-not-available-in-4-10-2/11959/3 "2020-06-09T17:18:48Z")

</div>

Thank you so much! Slicer team is the best!