We can get you a refund guyon, PM me your email, and I'll forward it to Mike, who handles that side of things. The intention was definitely not to mislead, the plugin and the editor are moving into free open alpha, so this announcement wasn't meant to garner additional sales. Development of the Construct 2 plugin begins after the Construct Classic plugin is complete.
I'm not ready to give a concrete release date for that yet, as it's evolving with the editor, and with user input, which will be beginning today.