Can not activate

Down loaded plugin but it will not activate. Have you heard of this before and can you give me an idea as to what I need to do in order to get get up an running. The error is listed below.
This plugin looks to be what I have been looking for,
Please help if you can .

Warning: require(__DIR__/class/class-login.php) [function.require]: failed to open stream: No such file or directory in /home/content/22/10649022/html/My-site/wp-content/plugins/login-form/login-form.php on line 13

Fatal error: require() [function.require]: Failed opening required ‘__DIR__/class/class-login.php’ (include_path=’.:/usr/local/php5/lib/php’) in /home/content/22/10649022/html/My-site/wp-content/plugins/login-form/login-form.php on line 13

https://wordpress.org/plugins/login-form/