To install the map you just have to take the file Circuit Ocean Formula 1.3.xml 
and to put it in the folder : C:\Program Files\Rockstar Games\Grand Theft Auto V\menyooStuff\Spooner

To load the map, launch Menyoo then go to Spooner Mod then Manage Saved Files and load Circuit Ocean Formula 1.3

IMPORTANT!! install all the requirements wich are in the requirements folder