Hi! In order to play games made with RPG Maker VX Ace and earlier, you have to download the RTP. With this you can play any game made with that version of RPG Maker :)
Here's the link: https://www.rpgmakerweb.com/run-time-package -- If you scroll down to the bottom you'll see all the versions, so just download the one for VX Ace! ^^
Hope that helps!