Download the two files. They will come compressed by Dropbox, you will need to unzip them and then double click on GWOJ-Demo Setup.exe. If the game installs but you receive an error upon start up that says "RPG Maker 2003 RTP is not found" you will need to go into the game folder and find "rpg2003_rtp_installer.exe" and run it. This will solve your problem.
Sometimes antivirus programs will question the safety of the files and ask you to give permission to allow the program to make changes to your computer.