No Exploration/Rank required for customizing 1.0.0 Mod
Extract the file in the zip to your desktop then goto C:\Program Files\Epic Games\SnowRunner\en_us\preload\paks\client\ and overwrite the initial.pak file with the one you extracted to the desktop. If you changed where Epic installed your game go there. I have tried to get subscribing working but it creates duplicates because of how the game puts file in the game with the mod system, If your fine with that subscribe and your good to go if not use the above instructions.