Let’s be direct. Downloading a FitGirl repack is software piracy. SCS Software is one of the few "good guys" in gaming—they release free updates for 8+ year old games and have never used aggressive DRM.
When you buy ETS2 on Steam, you get the base game—Germany, UK, and the Benelux countries. To get the full experience, you need to purchase: Let’s be direct
Current information on ETS2 releases and repacks suggests the following: Game Version and Repack Status you get the base game—Germany
Steam’s launcher eats RAM. The FitGirl repack is standalone. You click the .exe, and you are driving. This results in: Let’s be direct
Hit the Road: Euro Truck Simulator 2 v1.27.2.1s Full DLC Experience