Are you trying to apply this to the or a different repack ?
Usually multi-language, indicated by "Temporada" (Spanish/Portuguese). GRID.Temporada.3-CODEX.part04.rar
Copy the files from the CODEX folder inside the ISO to your main game installation folder, overwriting existing files. 4. Technical Specifications File Type: Compressed RAR archive (split). Size: Generally high (several GBs total). Software Required: WinRAR or 7-Zip for extraction. Are you trying to apply this to the or a different repack