Free version

This has been discussed elsewhere but I can't find a specific answer relating specifically for Creator.

I have signed up for the free version (I think), at least I did not enter any payment details.

As I have invested quite a lot of time and effort into developing (quite a good) app, I want to know exactly what will happen when I hit day 15? Will the app behave any differently or will I be forced to upgrade my account to keep using the app?

Thanks