Simplified Google Maps is a very unique plugin, it will allow you to easily create, administrate and customize maps at the WordPress site.
Currently we are supporting 3.5, it may work on older versions too but not guaranteed.
For installation instruction see the installation section
Google Maps API is probably down. Don't worry this this happens rarely and lasts a short period of time.
Yes ! of course
To enable the debug mode modify the Cetabo_Registry::put('PLUGIN_DEBUG_MODE', false); to Cetabo_Registry::put('PLUGIN_DEBUG_MODE', true);