Version 6.6 was problematic with iOS 8. Thus skipping this version v6.6.iOS 8 users can retrieve version 6.5 instead (delete current installation if you already installed v6.6), whereas iOS9/10 users...
Version 6.6 was problematic with iOS 8. Thus skipping this version v6.6.
iOS 8 users can retrieve version 6.5 instead (delete current installation if you already installed v6.6), whereas iOS9/10 users can keep using v6.6 or update to v6.7.
For information, this is just to support the latest and only supported version of Dropbox API. This means as well that Dropbox feature is now no more compatible with iOS8.