Always set your input gamma to 2.2 (sRGB) for Diffuse maps, and . Archshaders Vol 3 textures are named clearly:
For the most up-to-date documentation and a full material list, you can view the official PDF catalogue Evermotion website V-Ray render settings recommended for these high-detail materials? 50 Materials Archmaterials vol. 3 - Evermotion archshaders vol 3 for vray
Unlike generic texture packs, ArchShaders Vol 3 provides "drag-and-drop" complete shaders (diffuse, reflection, glossiness, bump, and displacement maps) calibrated for V-Ray’s physical rendering engine. Always set your input gamma to 2