You can find the No-CD executable on community sites like Fly Away Simulation .
Move the downloaded No-CD fs9.exe into that same root folder.
Running Microsoft Flight Simulator 2004 (FS9) on modern systems like Windows 10 or 11 often requires a because Microsoft deactivated the "secdrv" driver responsible for older disc-based copy protection. Essential FS9 Launch Fix Guide
Right-click the new fs9.exe , select Properties > Compatibility , and check Run this program as an administrator to ensure it has proper write permissions.
To prevent crashes or black screens: IF YOUR FS2004 WILL NOT START UP READ THIS