gruant2000381341 is right on the first questions. And i just wanted to add that your License will give you two activations, so you can install the HTML Editor on two separate computers and use it as many times as you like.
In regard to your second question, we don't have scripts specific to parsing your message, but if you have explain a little bit more about what you want o happen, i could assist you in writing a php script to remove the some of the tags.