How to get rid of "This form was upgraded" message?

[Samir_Ghosh]

I'm getting a pop-up saying "This form was upgraded" when I edit one of my forms.  I've tried both options it gives me, but I can't get the message to stop popping up.  It's unclear what to do.

[Kurt_Germaine]

It's also unclear what the message is anyway, they are trying to scare you into using the new interface designer with an annoying message.