Prepare and play
ZIP the contents of your installed English demo folder, keeping English/RCT.exe, Data and Scenarios together. Select that ZIP in the player. After the intro, choose New Game and a scenario. Use the mouse to build and inspect rides; P opens park management.
Demo session
The original demo runs for about 25 minutes and disables saving and loading parks, saving track designs and ride music. Refreshing ends your park and asks you to select the ZIP again. Game files stay in this browser session; no account is needed.
Credits and open source
Wine-Assembly / berrry-wine by Vladimir Grichina and contributors (MIT), with LGPL and OFL fonts. RollerCoaster Tycoon © Chris Sawyer / Hasbro Interactive. Supply your own English demo files.