Do you have another android device? If so, you could install it there, purchase a licence (if necessary at all, I'm not so sure anymore, they mention in-app purchases in the app description) and then sideload it on the zx2. Of course, you can also load it on your zx2 and see what happens. Again, the app runs on my zx2. Not as well as the genuine media player. However, surely not less smoothly than for example Tidal. After all, Android 2.4 is not state of the art anymore. This you must always bear in mind. For extracting the apk file from the play store i used the "apk mirror installer (official)" which is available in the store, too.
P.S. In the change log of the last version that I installed a few weeks ago, they even mentioned a bug fix for the zx2. I still have the apk. If you should face problems with the new version I could e-mail it to you .