In version 8.0 we started to follow the Windows standard that the program is typically located in c:\Program Files\HELI-X8 and the data (airports and models) in C:\ProgamData\HELI-X8. However, in a full installation with every airport in high resolution, the data needs several GB space, and some users prefer to put this data on another place (for example, when they have a fast but not so large SSD as volume c:). We updated the windows installer accordingly. If you want to change your installation, please make first a deinstallation of HELI-X and then a new installation.

Windows installer