Hi Bernie,
Sorry for the delay.
It is perfectly possible that the FSX uninstall still has left some entries in the Windows registry active. Those entries are used by SODE to determine if a sim is installed on the machine.
You could check the PLTMGR_DETECTION.log file located at C:\ProgramData\12bPilot\SODE\log. It will tell you the registry keys in question for FSX. Usually it’s SOFTWARE\Wow6432Node\Microsoft\Microsoft Games\Flight Simulator\10.0 -> “SetupPath”
If you delete this key, SODE won’t assume FSX to be installed anymore.
-Jeffrey