Um, that's strange. If this screen appears, it means that you have indeed placed archive.rpa in the right place but the game is unable to retrieve the images. Have you tried waiting a minute and then restarting the game? Sometimes it takes a little while for Android to 'notice' the new files. If not, it is possible (rare but not impossible) that the file was corrupted during the copy or download. In the first case, you can try deleting it and copying it again, or re-downloading a new copy.