still wouldn’t work as then each route would be it’s stand alone version and you would have multiple instances of the core installed which would take up more space. Perfect example being tram simulator. You have 2 different routes which both have separate installers meaning the same sim is basically installed twice
Could be a similar setup to some collections, If you already own the core you won't get it again. Same thing happens with some TSC DLC that has the model packs or a piece of rolling stock bundled with it.
Is that the one from TramSim where the routes are based in Wien? If so I will knock it off my list of possible purchases
Vienna and Munich iirc. This is them here in my steam games list as you can see you get 2 downloads one for each one. They are pretty good sims though i enjoy them