If you want to have your DVR server beta update on its own I wrote two files that will do this every night.
The first file is a .plist that goes in your LaunchAgents folder. This file triggers the update at 2am every day. You will need to edit two lines in the file so it points to your user folder. Change the XXXXXXX to the name of your user folder on your Mac.
The second file is the script the .plist launches that does the actual update. Place this file in the ChannelsDVR folder. This folder is inside XXXXXX/Library/Application Support/ChannelsDVR. Again the XXXX is your user folder. just drop the file in ChannelsDVR folder.
Here is the download link for the files.