Can I install the app on an offline theme or a dev store and publish later on?
Question: My store is not yet launched and I want to install the app prior to going live so that I can test it first then publish later on when everything is ready. Is this possible?
Answer: Unfortunately, this is not possible. There is no dummy theme where the app can be installed prior to going live. You can install the app though and take advantage of the trial period for 7 days to see if the app works well for you.