This is the latest patch for RollerCoaster Tycoon, version V1.08.187.
Rollercoaster Tycoon can now be played under Microsoft Windows 2000. There was an issue where guests would stop entering the park once the player had reached a certain level of ride research. This problem was only evident in the first ten Loopy Landscapes scenarios. This has also been fixed so that guests will continue to enter the park throughout the duration of the scenario.
You can check which version number you currently have by selecting 'About RollerCoaster Tycoon' from the disk icon pull-down menu while playing the game - The version number will be displayed at the top of the window before the credits.
If you don't already have the latest version, you can download and install a patch to update your game and take advantage of the latest bug fixes.