Anyone tried the 'Rocket Languages' Android .apk?

I am working as a Native English Oral Teacher in China at the start of a 2nd academic year here in China. This time I want to make a lot more effort to learn Chinese - to understand and speak Putonghua. So I have signed up to 'Rocket Chinese Premium Online/Download Version + Free Rocket Chinese Survival Kit'. I bought a Gretel W80 Android Smart Phone (MTK6515) from WalMart when the screen went on my Nokia N95 8GB phone. I notice there is a Android App (and for ios) for Rocket Languages. https://www.rocketlanguages.com/blog/2013/finally-the-ios-apple-app-is-here/ https://www.rocketlanguages.com/blog/2012/time-for-the-next-big-thing-from-rocket-languages/ https://www.rocketlanguages.com/blog/2013/upgraded-android-app-and-news-on-the-apple-app/ The problem I have with my W80 Android phone, is is not being a genuine Android Market so never upgraded to working on Google Play Store. so I have to find other non-market download from. I managed to get such Rocket+Languages.apk from this one:- http://apps.appsgeyser.com/desktopify/android/download.php?widget_name=Rocket+Languages&or=portrait Having installed it to my W80, the Rocket Languages Android App V.0.1, does not seem to work to good! I click the on-screen Blue Button for Playback, bit nothing seems to happen, Same with the Red Button for Record Perhaps I need the version 2.0 of the Rocket Languages Android App release? But where (other than PlayStore) to download it from please? Anyone had success using the Rocket Languages Android App?