Using SCS Unlocker 2.0 is relatively simple. Here's a step-by-step guide:
Providing a way to repack edited assets back into a functional .scs format for the game. Where to Download SCS Unlocker 2.0 Unlocking .scs files - SCS Forum - SCS Software scs unlocker 2.0 download
Opening files that standard ZIP utilities or the official extractor cannot handle. Using SCS Unlocker 2