1. It would be friendly if DCU were to offer to close a running app before (or during) installation of an update.
2. Just now I ran DCU and if found updates for itself and for FARR. It downloaded them both, then installed itself and restarted itself. But then it didn't realize that it had already downloaded the FARR update, so it did it again. No big deal, but better if it recognized the file and didn't repeat the download.