In this new Ren'Py version, you can't play S3 unless you uninstall S2 first. I recommend copying your old save files from
Internal storage(it could be your sd card too)\Android\data\com.mistermister.motherless\files\saves
and pasting them into the new S3 folder.
Viewing post in Motherless Seasons 1,2 & 3 Complete comments
Due to recent changes in Ren'Py, MP4 videos are no longer supported, so we're converting all video files to the OGV format.
SEASON 1 FOR ANDROID