system
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I don’t know about updating avast and getting Dropbox but I will tell you when I used the stub installer to download avast I got Dropbox. No opt-in or opt-out. During the install avast proceeded to download and install Dropbox without any input on my part. This was awhile ago so I don’t know if avast changed it’s policy but it was something I did not want or need.
This is almost as bad as having a signed dll from Open Candy on Software Updater which thankfully avast did away with.