To install directly from your WordPress dashboard:
- Go to the Plugins menu and click Add New.
- Search for Force Password Change.
- Click Install Now next to the Force Password Change plugin.
- Activate the plugin.
Alternatively, see the official WordPress Codex guide to
Manually Installing Plugins.
Download from GitHub
You can also download this plugin from GitHub at
https://github.com/lumpysimon/wp-force-password-change