The first apk, version 0.2.8 (I & II Acts), is the version in which the main characters' events end at level two, and at the end, a major event ends the Act. The new version, 0.3.2.5, and the following is the version in which the Third Act goes and the level three events for the main characters.
That is, if you have never played WSS, it is recommended that you play the I and II Acts version first, and then download the new version and transfer your saves to it to continue your playthrough.