I JUST PURCHASED THE SIM AND IT SHOWS THAT I BOUGHT IT, BUT I CAN'T LOAD IT. ANY HELP WOULD BE APPRECIATED. THIS IS THE EMAIL I RECEIVED FROM STEAM: Hello papa6551, Your activation of Train Simulator 2021 Deluxe (ROW) was successful.
There can be a delay between buying something on Steam and it downloading. If you haven't got it or seen it start downloading yet have you at least got a Train Simulator page in your Steam Library? If so go to it, roll down to the DLC and click, "Manage my DLC" which will list everything TS. If there's no indication that things are downloading untick the missing item/s, exit the list then go back and retick it- that should nudge Steam into starting the download straight away.
Have you installed the Steam Client - that is where you will find you game and every add-on from Steam. If you have installed it go in to the Steam Client > Library > Chose Train Simulator 2021 and push Play.