In the file you will find four versions of the Lego Duplo 10815 set assembly which are suitable for filling children’s rooms plus one group of individual parts just in case you want to collect something yourself.
Who works in the V-Ray version is lower than 3.1. Be careful the materials in the BRDF section are Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.