I bought 2 routes on steam version of TRS 22 and steam shows them as installed but they are not in game.Steam says they don't support this how do I open a ticket with NV3.Not off to a very good start with T 22.Other people are posting on steam with same problem.
Once you purchase them, open the Trainz Launcher, there are 4 buttons, bottom one is Content Store, click that. Look under Purchased and you will see the routes you bought, click on the Install button and you should be set.