Issues with plugin

(1) On product activation page, the field "Installation Date" should be "Activation Date" or "Purcahse Date"

(2) Users are able to register a serial number more than once, and this is not acceptable

(3) When you register a product, it saves Twice and also sends out email twice to admin. (pre registration plugin)

(1) On product activation page, the field "Installation Date" should be "Activation Date" or "Purcahse Date"

Please go to Registration form settings

And change label here. 

(2) Users are able to register a serial number more than once, and this is not acceptable

On same setting page please uncheck this box

(3) When you register a product, it saves Twice and also sends out email twice to admin. (pre registration plugin)

I have tested this please download and update your plugin this will solve the problem.