You could get in touch with the TuneECU guys and ask about the incompatibility, I guess. It could be down to hardware or software versions, not sure.
You can go to
News and there's a link to a demo version. It's an .apk file, so you need to download it on your phone browser, and then go into settings to allow installing from non-Play Store sources (under the security settings). So called "sideloading" is generally less safe than getting things from the Play Store, so ymmv.