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!

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!