Hi,
I purchased the app in July, and didn't receive warning until last night, when I reinstalled the app due to some issues with it. When I read the page, it said that they were changing corporations in the app store and that the window to get the new one for free for paying customers was December 10th - 23rd. I didn't receive this message til yesterday, the 12th.
Now I read this forum page and it says it needs a copy of the receipt, I do not have the email anymore, so is it OK to take a screenshot of my iTunes page where it says I bought the app?