No mention of the comments on the Download pageInstallation Instructions:-
Unzip this package to a temporary folder, e.g. C:\Temp and click on RW_AssetSetup.exe
The installer will open and should display the path of your TrainSimulator 2014 folder
If not click on the '....' button and navigate to your TrainSimulator 2014 folder in Steam
Click the 'Install to TrainSimulator 2014' button and thats it
Peter