The apple tree model is presented in three versions:
Autumn apple-tree - autumn leaves and apples on branches. Summer apple tree - green leaves and apples on branches. Spring blossoming apple-tree - small green leaves and flowers on the branches.
Trees are divided into three groups - according to the time of the year. Each group (tree) consists of objects: Roots Trunk Large branches Branches Small branches Leaves Apples Flowers (in spring version)
These objects are not merged into one mesh, so that if necessary, you can easily modify them (select, modify, hide, assign modifiers, delete, etc.).
Who works in the V-Ray version is lower than SP1, be careful, the materials in the BRDF section are Microfaset GTR (GGX), if your version is older than SP1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you.