the best thing for all of you to do, is:
1.) to uninstall your current version of rocket player
3.) allow your mobile to install APKs from unknown sources
4.) install APK (you should be able to do so directly from the notifications pulldown; if not, look in the recents in your my files folder)
5.) from rocket player's google play page, disable auto-updating (i found out the hard way, a couple of hours ago, when i went to play some more music from rocket player
obviously the new owners are not interested in fixing their player; why, i truly do not know
but, at least we are not completely screwed over, here
i believe you'll be able to maintain your playlists, like i was able to; though, yeah..
..you'll need to reconfigure everything else, upon reinstall
but, when compared to the alternative, i believe that is but small inconvenience
i must reïterate: disable auto-update