Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/flexpress/plugin-security/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
FlexPress security plugin
Install
composer require flexpres/plugin-security 1.0.*
Then you want to enable it in WPAdmin > Plugins. Once activated and installed you may want to tweak the settings which can be found in WPAdmin > Settings > Security.