Sadly, at the moment I am still a poor impoverished Maths teacher and this piece of software is the end result of many months of my own hard work. For this reason, I have decided that an amount of £9.99 is not too much to pay if you want to keep using it. Hopefully you'll agree! with Note:  Unfortunately I can't afford automated responses yet, but as soon as I recieve a payment confirmation I'll send you an email myself with the unlocking code. This hopefully shouldn't take more than 24 hours... thanks for your patience!