I've just updated my Pro version and my Norton Security didn't mind.
This will be a false positive and could be caused by a bad Definitions update.
I suggest that you use your restore points to go back to before you updated, bring Norton back up to date and then try the WR update again.
A little while ago though, my Norton Security kicked out the WR .exe and even removed the desktop icon, wouldn't let me reinstall it and did the same when I rebooted to normal mode after reinstalling it in Safe Mode.
I had to contact Symantec who whitelisted it and after a couple of weeks, I removed it from the white list and it's been okay ever since.