That's one reason I avoid the subscription model, when I can. I travel a lot with a laptop, and there are few things more aggravating than trying to download email and attachments from work over a crappy airport WiFi connection before the final boarding call, only to find your computer is tied up downloading and installing the latest AV-signature package, Windows security patch, or new iteration of Flash (with which Adobe always tries to slip in the Chrome browser, if you don't spot it and uncheck that box).
Only the Doomed select "update automatically."