How can I disable new plugin and theme install, but allow updates?
This would probably make a job done, although using die is not the pretty way add_filter( ‘upgrader_package_options’, function( $options ) { if ( isset( $options[‘hook_extra’][‘action’] ) && $options[‘hook_extra’][‘action’] === ‘install’ && isset( $options[‘hook_extra’][‘type’] ) && in_array( $options[‘hook_extra’][‘type’], [ ‘plugin’, ‘theme’ ] ) { die(‘Plugins & Themes installation disabled!’); } return $options; } );