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Once fully updated and linked up to your Dropbox account, the Dropbox code that starts when the controller is powered on should stop trying to launch Chrome with a page that urges you to update.
V2.10.0 or Later
With PP running, type Alt-E to bring up Gedit. Then click Open. Then type Alt-Up Arrow. That takes the File Open dialog up one directory and you’ll see dropbox.py sitting there on the internal drive. Select it. Then go down to line 866, delete it, and click Save.
Then run ADMIN DROPBOX again.
If you click the Uninstall button, that deletes /home/operator/dropbox.py and upon the next Install button click, it will download it again from dropbox.com and it will be broken again.