Orthovoltage dose engine not available in 4.10.2

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

Thank you so much! Slicer team is the best!