Not sure what you're asking.
Pre-release builds do not auto-update. That build in your screenshot is not the latest. Only way to update prerelease is by doing it manually.
Pre-releases do not update even if there is a regular release available?
Are you trying to prevent Channels DVR from automatically updating when a new stable release comes out?
Pre-release version updates only happen when manually selected.
Make its code directory read only, and its data directory r/w
channels-dvr Read Only
Worked for me when I wanted to do the same thing.