In order to make this work, your Macros (now Devices) must be unhidden (white icons). You will also have to ensure that at least 1 page in the Macro (Device) is unhidden. When you do this, you should be able to navigate to the Device Overview page and select your old macro.

Might I suggest pressing F1 and reading up on how to import images into the gallery from outside of ProntoProEdit NG?