private static function do_install_step( $product_id, $install_args, $step, $upgrader ) {
		$state_steps = self::get_state( 'steps' );
		if ( empty( $state_steps[ $product_id ] ) ) {
			$state_steps[ $product_id ] = self::$default_step_state;
		}

		if ( ! empty( $state_steps[ $product_id ]['last_error'] ) ) {
			return;
		}

		$state_steps[ $product_id ]['last_step'] = $step;

		if ( ! empty( $install_args['activate'] ) ) {
			$state_steps[ $product_id ]['activate'] = true;
		}

		self::update_state(
			'current_step',
			array(
				'product_id' => $product_id,
				'step'       => $step,
			)
		);

		$result = call_user_func( array( __CLASS__, $step ), $product_id, $upgrader );
		if ( is_wp_error( $result ) ) {
			$state_steps[ $product_id ]['last_error'] = $result->get_error_message();
		} else {
			switch ( $step ) {
				case 'get_product_info':
					$state_steps[ $product_id ]['download_url'] = $result['download_url'];
					$state_steps[ $product_id ]['product_type'] = $result['product_type'];
					$state_steps[ $product_id ]['product_name'] = $result['product_name'];
					break;
				case 'download_product':
					$state_steps[ $product_id ]['download_path'] = $result;
					break;
				case 'unpack_product':
					$state_steps[ $product_id ]['unpacked_path'] = $result;
					break;
				case 'move_product':
					$state_steps[ $product_id ]['installed_path'] = $result['destination'];
					if ( isset( $result[ self::$folder_exists ] ) ) {
						$state_steps[ $product_id ]['warning'] = array(
							'message'     => self::$folder_exists,
							'plugin_info' => self::get_plugin_info( $state_steps[ $product_id ]['installed_path'] ),
						);
					}
					break;
			}
		}

		self::update_state( 'steps', $state_steps );
	}