Installing Trainz is quite simple.
The installer for Trainz 2009 can be downloaded from the Download section.

After double-clicking the installer, the installation wizard will open.

You can follow this wizard until it prompts you to enter user information.

Fill in the user information as follows:

• Username: The email address linked to your Auran account
• Organization: This field can be left blank
• Serial Number: The serial number for your Trainz copy

After entering the user information, click Next.
You can freely choose the installation path.
Additional options such as a desktop shortcut or a quick launch shortcut can be selected as desired.

At the end, you have the opportunity to review the installation and then proceed with it.