Try these steps and let me know if this works or not.
1. Use FTP or your Web Host control file manager and delete the /bulletproof-security/ plugin folder.
2. Reinstall the BPS plugin using the WordPress Plugin installer.
Note: When you manually delete a plugin folder and reinstall a plugin on the WordPress Plugins page then that will not affect your database settings for a plugin. In other words, you are just deleting and reinstalling plugin files and your plugin settings are not affected in any way.