Hi,
Unfortunelaty, the project has been made with absolute directories file properties (thanks to Klaus !), and not relative to the application directory ($ApplicationDir). So you have to modify it according to your installation.
The first solution is to delete all the file in the project and add them with their new path.
The second one and the more efficient is to close Ride, edit the "Drummer.rprj" and "Drummer.rapp" and modify all the path entries. This files are XML text files easy to modify, but be carefull !
Yves