Install:
Turn it on RAR file you downloaded. Found in the. SCS file extension My Documents / Euro Truck Simulator / mod / copy in Folder
1.Alternative(Hotfile.Com)
http://hotfile.com/dl/128330940/52aedf6/Mercedes-Benz-3560-8×4-MP21.rar.html
2.Alternative(Uploaded.to)
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3.Alternative(Uploading.Com)
http://uploading.com/files/785f41bc/Mercedes-Benz-3560-8×4-MP21.rar/
Note: You can download using an alternative.