Can only tell you what happened with me, downloaded the RTP free version, opening it popped up a window in another language except for a box said 'OK'. I clicked that and it extracted files, making a new folder with the same name as the file. From that I could start the game. If that doesn't work, could be you need to download some files for RPG maker - https://s3.amazonaws.com/degica-downloads/RPGVXAce_RTP.zip
Had to do it for Caliross so might be needed here.