You may test GasTurb yourself. The Entry Level Version of GasTurb is a fully working program for the turbojet, turboshaft, turboprop and turbofan configurations. However, it is limited to the Novice mode for all engines except the turbojet.
The Entry Level Version of GasTurb 9.0 is packed in the self extracting file Setup_Gasturb9Elv.exe (5.1 MB). This program requires Windows 95, 98 or Windows NT, 2000 - it will not run with Windows 3.x.
In the download directory, you will also find the file GasTurb9Intro_PowerPoint97.ppt (2.8 MB). This PowerPoint presentation requires PowerPoint 97 or PowerPoint 2000 installed on your computer. Downloading this file should cause PowerPoint to start automatically.