drop towncar98 folder in :

mods/updates/x64/dlcpacks 

then go in :

mods/updates/updates.rpf/common/data

find dlclist.xml , right click, edit and add this line : 

		<Item>dlcpacks:/towncar98/</Item>

If you want to change tyre textures, go in open iv

follow this paths :

mods/updates/x64/dlcpacks/towncar98/dlc.rpf/x64/vehicles.rpf/towncar98.ytd

go in edit mode, open the ytd and replace tyre_side2/3 by the tyre textures of your choice
( tyre side 2 is for the limo and 3 for the sedan )

save, and your done.

that all, thanks for downloading! 