First drag and drop the extension folder from the zip file into the assetto corsa's root folder i.e [Steam\SteamLibrary\steamapps\common\assettocorsa]
Next go to the skin folder of your choice and then paste these lines in the ext_config.ini[INCLUDE: ms6/ms6_bayro4_evo_real_logos.ini]
save config file
in some cases its recommend to delete some of the following files inside the skin folder:EXT_DECALS_DIFF.ddsEXT_DECALS_MAP.ddsEXT_DECALS_NM.ddsINT_DECALS_DIFF.ddsINT_DECALS_NM.ddsINT_DECALS_SW_DIFF.ddsINT_DECALS_SW_NM.dds
Credits: some Interior Logos by SKUBY, thx for your work