The most straightforward and legal way to download Euro Truck Simulator 2 is through its official website or a digital distribution platform like Steam.
was a major free update released around July 2022. It is not the latest version (current is 1.54+ as of 2026), but if you specifically need 1.45 for mod compatibility or preference:
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SCS Software's blog: Euro Truck Simulator 2: 1.45 Update Release