The download is split into two separate packs:
TC 60's pack (Austin Healey 3000, Lotus Cortina, Ford Fairlane, Ford Mustang, Hillman Imp, Jaguar mkII, MG-A, MG-B GT, Mini Cooper, Toyota 2000GT)
TC 70's pack (Porsche 911RS 2.7, Alfa GTA, Alpine A110, AMG 300SEL, BMW2002, Datsun 510, Ford Escort, Mazda RX3)
Needed DLCs from Assetto Corsa
The pack is needed, because some files of the Kunos Ford Escort are required for the TCL Ford Escort.
Porsche Pack I
The pack is needed, because Kunos Porsche 911 is used as a base model for the Porsche 911 RS 2.7 in the TCL-Mod.