If this file is actually a collection of digital manuals or technical documentation rather than a game mod, you can verify procedures through official channels:
This method adds the car as a completely new vehicle without replacing existing game files. MERCEDES_S63_AMG_VEHICLES-CENTER.zip
: Use OpenIV to navigate to mods/update/x64/dlcpacks/ and drag the car folder there. Update the List : If this file is actually a collection of
This method swaps an existing game car with the Mercedes S63 AMG. MERCEDES_S63_AMG_VEHICLES-CENTER.zip
Go to mods/update/update.rpf/common/data/ and find dlclist.xml .