upgrading from Gas Cubby Free to ad free version

[davee]

I have been using Gas Cubby Free (version 2.5) on an old iPod for years. The newest version of the iOS the iPod can install is iOS 6.1.6 and it is up to date. I recently bought a new iPhone 6 and today I bought the ad free version of Gas Cubby for my iPhone. I would like to be able to do the following things but I am having problems. Any advice and/or information would be helpful.

1) Import the old data from my iPod into my iPhone. But I seem to have no way of doing that as I do not seem to be able to install the ad free version on my iPod without doing that I can't send the data. The new version of Gas Cubby which I bought from iTunes requires iOS 7 or higher

2) It would be nice to be able to use both my iPod and iPhone for inputting data and syncing but I don't see how I can do that unless there is an older version of Gas Cubby Free that I can install on the iPod.

Have others had this problem and if so I did you solve them.