Place the folder ""Corvette63GSF5"" in 
D:\Games\V\Rockstar Games\Grand Theft Auto V\mods\update\x64\dlcpacks

Now go to 
D:\Games\V\Rockstar Games\Grand Theft Auto V\mods\update\update.rpf\common\data
and open DLCList.meta and paste in as a new final entry line >>>

		<Item>dlcpacks:/corvette63GSF5/</Item>

Start game and enjoy