NOTE: if you reboot your computer, the Dropbox auto-update task will enable again, so each time you reboot, you will need to disable the auto-update process. Just repeat STEP 5. There is no real way to turn it off permanently, and there's a whole Dropbox thread about it. If you want to read about it, it's here. -and-Installations/How-to-disable-DropBox-Update/td-p/199292 I wouldn't recommend it anyway because you do actually want the auto update to work, and it's part of Dropbox's policy. I wouldn't mess with it anymore permanently. If you are in contact with a Dropbox engineer via email as part of this issue, they will be able to turn it off for you on their end, but you have to ask.