Instructions
Visit Roller Coaster Tycoon 3 Ride Exchange provided in the Resource section. Click "Register" located on the main navigation bar.
Enter the appropriate information then click on the underlined text labeled "Terms of Service." If you agree to the terms, check the box and click "Sign Up" located at the bottom of the page.
Verify your email address. Navigate to your email inbox and open the email sent from My Atari Team. Click on the activation link to verify that you are the owner of the email address. You will be redirected back to the Roller Coaster Tycoon 3 Ride Exchange.
Click "Ride List" located on the website's main navigation bar. A list of user-created expansions will appear. Cycle through the list until you reach a ride that catches your interest. Click to select it. You will be redirected to the "Ride Information" page.
Scroll to the bottom of the page and click the "Click Here" button located in the "Download" field. The file will now be downloaded to your computer.