you will need to download part one and play through it and then download either part 2 stand alone or the update pack, if you download the part 2 update pack it will "Replace" the part 1 app with part 2 and you wont have to move save files, if you download the stand alone you will have to go into the devices data folders and find the games save data for part one and copy into the part 2 stand alone folder. Hope this helps