I want to get it downloaded now, but not install it yet. I want to get my MacBook backed up before installing, just in case things go bad, but I won't be able to do that until Friday. Can I just download it now and then install it on Friday?
Install process won't happen automatically, it will just sit in the Applications folder. At least that's what I've read. I'm still waiting for the download.
OK, it just finished downloading, it does pop-up a window to start install, but you can easily quit it.