While there isn't a single official "Singham Installment" guide, the process typically involves these steps:
Navigate to the path specified by the mod author (e.g., x64e.rpf\models\cdimages\componentpeds_s_m_y.rpf\ ). gta-singham-installment-tutorials
Drag and drop the downloaded .ytd and .ydd files into this folder. While there isn't a single official "Singham Installment"