Assuming you have found a legitimate ets2_update_1_4_5.exe file, follow these steps:
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Some users prefer standalone, DRM-free copies of games. While Steam is the primary distribution method today, physical or older digital copies of ETS2 (pre-Steamworks integration) often run version 1.4.5 by default. Assuming you have found a legitimate ets2_update_1_4_5