Like many programs and applications, Dropbox may automatically update to the latest version. These updates are rolled out gradually after a new update is available, and are necessary to keep the desktop app functioning.
You cannot disable or turn off auto-updates.
These updates ensure you’re running the most up-to-date version of Dropbox, which often has performance and security enhancements. And if Dropbox can't keep itself up-to-date, some features may stop working. For example, the app may stop syncing.
Notes about auto-updates:
If Dropbox software is installed on your computer, it will update regardless of whether you installed it or the application came preloaded by the device manufacturer
The proxy settings you add using these steps aren't used to update the Dropbox app
Dropbox uses your operating system network settings to apply auto-updates