The instruction is originally created fo ETS2 1.50 but it is the same process for Promods 2.71 for ETS2 1.51. Short 13 minutes guide how to download and setup #Promods for free. It takes more than hour real time so to speedup procedure you can pay for one link download as well.
Links:
https://www.promods.net
https://www.7-zip.org

Telegram: https://t.me/trcksm

New areas added in Promods 2.71