Jim Dalrymple at The Loop is reporting that starting today, the Mac App Store will automatically download the macOS Sierra installer:
It’s important to note that this is not an automatic installer—this process will only download the update in the background, and then alert you that it is available to install. You can choose to install it when its convenient. You can also choose to ignore the update.
Apple says that if your machine does not meet the requirements for Sierra, or is running low on disk space, the update won’t be downloaded. If it is downloaded and disk space gets tight, the system will delete the installer. The installer will not be downloaded unless the Mac App Store preferences are set to automatically download updates.
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