Because of the special network reason, you can not normally access Google, causing the chrome update failed, but when you can normally visit Google, you still may not be able to update the normal chrome, show Update failed: Error 4. As shown in the figure.
This happens when you are not able to access Google correctly, but when you are able to access Google correctly, you may also receive an update failure: Error 4.
When you have a normal access to Google, and the update fails: Error 4 o'clock, you can do this:
Turn off Chrome, open Task Manager, end the Google installer, and check for updates as soon as you are sure to have a normal access to Google and turn on Chrome.