If you want map expansions, ProMods 2.20 was the definitive version for v1.28. 2. How to Install (Step-by-Step)
Jazzycat has released over 100 versions, but is the final one supporting ETS2 1.28.1. It adds hundreds of real cars, trucks, and buses to your traffic—completely changing the immersion. If you want map expansions, ProMods 2