Please note, I'm not talking about having to remove both of them if you had an earlier beta. I did that on Friday and installed the last pre-release beta.
But today, I installed the 1.0 Entrenchment release and the new Sins patch (queued them up for install while I went to eat, actually; they were both downloading when I left the machine), clicked on it in Impulse to run it, and got a big warning saying that Entrenchment needs Sins and Sins isn't installed. Eh? I took a look and indeed, Sins wasn't installed. I'm guessing that something about the Entrenchment update caused Sins to get wiped out. Now I get to download another 800 MB of game, which means, given my network connection, that I won't get to play the new release until tomorrow.
I'm not sure why this happened -- maybe the fact that I queued up both updates at once has something to do with it? Hopefully you can track this down and fix it, so no-one else gets hit by this one.