Hi Aaron,
as reported by the message, you are not able to open that project because you are working with the Community Platform. This free Edition offer you limited functionality and in the specific case you cannot open a project created with WebRatio Platform.
If you are a student or a teacher you can consider and agree to the University Program https://www.webratio.com/site/content/en/university-program. This program allow you to download and activate a dedicated version of WebRatio Platform.