You might see that even if Dropbox has been shutdown, the app might relaunch after an update. This is a vendor behavior we cannot control or change. If Dropbox is open during the patch, Automox will relaunch the app.

NOTE : If a file sync application is open when patching begins, Automox will always relaunch it after patching.

https://support.automox.com/help/patching-dropbox-on-windows-and-macos