When the update came out i need to delete the old version? and download the new version? If i has the old version and i download the new version it automatically update?
You'll have to reinstall it, remember to back up your saves
Game saves are stored here: PC - %AppData%\Roaming\RenPy\MurMur-#Numbers Android 10 or older - Android\data\RenPy\MurMur-#Numbers Android 11 or higher - Android\data\com.dd.murmur\files\saves
