In Euro Truck Simulator 2 it’s easy to install mods.

Copy and paste mods in: C:/Documents/Euro Truck Simulator 2/mod folder.

After that you need to activate the mods you want to use:

How to install modsHow to install mods

 

Mods are usually in .scs format files, but sometimes mod files can be compressed in .zip and .rar archives.
Unpack using 7zip or WinRar.