I finally solved the problem changing the path of the blender.exe to “C:/PROGRA~1/BlenderFoundation/Blender_2.82/blender.exe” note there are no spaces as you said. With that everything worked OK.
Anyway is a little bit confusing that the suggested installation path of Blender on Windows is under “Program Files/Blender Foundation/ Blender XX/blender.exe” but Flamenco worker doesn’t support spaces in path.