Searching for "V-Ray 3.6 for SketchUp 2018 Google Drive" will lead you to many websites offering "free" downloads, often bundled with cracked or patched files. Some of these sources may provide to the installer or cracked versions. While the intention may be to avoid the software's cost, this approach carries significant risks:
SketchUp 2018 remains a popular host application for V-Ray 3.6 due to its specific architectural advantages. vray 36 for sketchup 2018 google drive
Source: Chaos Group Official Documentation Searching for "V-Ray 3