Hi,
Indeed this project was not updated to be compatible with some updates of the ST lib and CircleOS. So there would be some tuning to do for using it in the latest Ride. We'll do it but it will take a little time. Also, it is designed for the Primer2 and it takes more than just changing the target CPU to port it to OP4.
In any case, the important thing in this zip is the pdf tutorial, not the example project. I suggest you follow the pdf tutorial, which should allow you to recreate this project using the current Ride/CircleOS, and for your own board, not another one.
If you prefer a ready made project than a tutorial, choose one of the recent project, designed specially for the OP4, in the Resources section.
Best Regards,
Vincent