I looked into it, and even though the game comes with RTP files included... It was possible to get an error when playing without the RTP installed on your computer. But I fixed it and updated the download link! Hopefully that doesn't happen anymore.
You should be able to play this game without the RTP! Make sure you click the red dragon icon that says game, not the orange and green gear icon. The gear icon is the project file, which is included because this version of the game is an open release.