1.use openIV an navigate to : mods/update/x64/dlcpacks 

,this is where you drag the Fiat175 folder or create a Fiat175 folder and 

put the dlc.rpf in.



2.navigate to : mods/update/update.rpf/common/data

from here extract : dlclist.xml and extratitleupdatedata.meta

Open extracted dlclist.xml(with notepad) and add line : <Item>dlcpacks:\Fiat175\</Item>

Save in notepad.

Put the modified dlclist.xml back to : mods/update/update.rpf/common/data

   Open extarcted extratitleupdatedata and add lines:


                </Item>
                <Item type="SExtraTitleUpdateMount">
			<deviceName>dlc_Fiat175:/</deviceName>
			<path>update:/dlc_patch/Fiat175/</path>
		</Item>

    
Save,and put the modiefied extratitleupdatedata back to : mods/update/update.rpf/common/data


Use a trainer to spawn the car by entering : Fiat175

Enjoy!