Confirming, getting this message after install:
“The plugin does not have a valid header.”
and limit option seems to not work
same here
Msg displayed upon attempted activation:
“The plugin does not have a valid header.”
nowhere to go from here
Received the same error, navigated to the main plugin page (change url in browser to remove everything after “plugin.php”) and activated it from there. So far so good.
I see similar issues with other plugins in the WordPress Support forum: http://wordpress.org/support/topic/the-plugin-does-not-have-a-valid-header-need-help?replies=11