Not sure why this is the case on some WordPress installs and not others. I work for a hosting company and we see it occasionally, if its the age of the install, the server, the WordPress plugins, no common denominator but here is a fix if the updater gets stuck.
- Go into file manager
- rename Divi to divi, this won’t break the site like you might think
- Run the updater again, It will create a new Divi folder and update
- Go back into File Manager and delete the lowercase divi folder
From now on the auto updater seems to work going forth, if not rinse and repeat until a cause/fix can be identified. Hope this helps someone, would like some feedback.