Multisite Widgets: Fatal error on activation – class muwidgets_default not found

There is a major problem with this plugin, may be wrong class name or creation of an object for invalid class, unable to activate, giving fatal error:
“Fatal error: Class ‘muwidgets_default’ not found in F:\wamp\www\myprog\wordpressdemo\wp-content\plugins\mu-widgets\library\base\application.php on line 118”

This is issue is still unanswered and not fixed. Please fix it asap.
Also, let me know the quick fix if any, so that I can run it on my blogs.

https://www.ads-software.com/extend/plugins/mu-widgets/