Yes this is unfortunate. I will check if we can somehow release the app for all devices. But I am afraid that will result in a difficult to message situation.
Sorry to burst your bubble, but this is Apple's ecosystem. 2 years is the very real artificial lifespan of "current" whether we like it or not.
Fun fact: I still have an iPad Mini 1 running some very ancient version of iOS that I use once in a while for single-page browsing. It gets the job done for very short sessions. I'm amazed the battery is still good.
Um…what? I'm on an iPhone 5! Not that ancient!