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Yea, that's what I am feeling now. :(

I am afraid of the statement of "lifetime payment". May be because I am a newbie to Internet entrepreneurship but I think the ability of providing the opportunity to users to small payments for a specific time would result in more sales rather one time huge payment.

Simply inform them about the issue you have just seen. I wonder why would they want to think you other wise as you are just trying to help? But for the worst case, consider keeping all of your records. Just be true to yourself what you have seen and say them to solve it. If you know how to solve, possibly, you can ask them some money saying you can fix it.

I am very glad that you replied. What ever you have explained above sounds to be really good to start with. Thank you. I will try my best.