I assume you're referring to this?
http://www.racedepartment.com/downloads/barbagallo-raceway-rdtcc-s10-edition.8695/
I just downloaded it, and all I'm seeing in the rar is a folder with the track name, and that contains the track itself, so it needs to go into Locations.
SCE\GameData\Locations\Barbagallo2013
Where "
Barbagallo2013" is the parent folder inside the rar. That will leave you with:
Folder:
SCE\GameData\Locations\Barbagallo2013\Barbagallo2013
Files:
SCE\GameData\Locations\Barbagallo2013\Barbagallo2013GMT.mas
SCE\GameData\Locations\Barbagallo2013\Barbagallo2013MAPS.mas
SCE\GameData\Locations\Barbagallo2013\ReadMe!.txt
SCE\GameData\Locations\Barbagallo2013\Sky.mas
SCE\GameData\Locations\Barbagallo2013\Sky2.mas
As Paul said, do it all in one go, which will help ensure that everything lands where it needs to be.
If that's what you've done, I have no idea why it's not loading, and as I said earlier, I don't have access to SCE to test right now.