We'll create fresh WordPress site with Force Password Change installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin redirects newly-registered users to the Admin -> Edit Profile page when they first log in. Until they have changed their password, they will not be able to access either the front-end or other admin pages. An admin notice is also displayed informing them that they must change their password.
New administrators must also change their password, but as a safety measure they can also access the Admin -> Plugins page.
New translations are very welcome – please submit them via WP-Translations. This plugin’s WP-Translations page is transifex.com/projects/p/force-password-change