Tip from the maxscript and mcg facebook group
pathToMcgFile = @"c:\\temp\\filepath.tool" Viper3dsmax = dotNetClass "Viper3dsMaxBridge.Main" Viper3dsmax.InstallMcgPackage pathToMcgFile true /* "true" is for seeing log in the Listener. Look in startup folder and ProceduralContent.ms file. For more tips */