Hi, 
  I am able to install fsuipc 3.98 but when I start FS9 I get the error "Flight simulator was unable to load some aircraft or software. You can contnue using Flight Simulator  
but this aircraft or software will be disabled.  File: FSUIPC.DLL". I ran registry checker before installing and if I delete fsuipc.dll from modules folder and reinstall version 3.93 
it works okay!  
install log 
Installer for FSUIPC.DLL version 3.98a 
Looking in registry for FS9.1 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\9.1 
     Parameter"EXE Path" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\9.1 
     Parameter"EXE Path" 
... NOT found! ... 
Looking in registry for FS9 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\9.0 
     Parameter"EXE Path" 
... >>>  OK! FOUND FS9!  <<< ... 
Looking in registry for FS8 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\8.0 
     Parameter"EXE Path" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\8.0 
     Parameter"EXE Path" 
... NOT found! ... 
Looking in registry for FS7 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\7.0 
     Parameter"path" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\7.0 
     Parameter"path" 
... NOT found! ... 
Looking in registry for FS6.1 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\6.1 
     Parameter"InstallDir" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\6.1 
     Parameter"InstallDir" 
... NOT found! ... 
Looking in registry for CFS2 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Combat Flight Simulator\2.0 
     Parameter"EXE Path" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Combat Flight Simulator\2.0 
     Parameter"EXE Path" 
... NOT found! ... 
Looking in registry for CFS1 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Combat Flight Simulator\1.0 
     Parameter"EXE Path" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Combat Flight Simulator\1.0 
     Parameter"EXE Path" 
... NOT found! ... 
=========================================================== 
INSTALLATION FOR FS9: 
EXE Path="D:\Program Files\Microsoft Games\Flight Simulator 9\" 
Checking if there's already a version of FSUIPC installed in: 
       D:\Program Files\Microsoft Games\Flight Simulator 9\Modules\FSUIPC.DLL 
... Version 3.930 found. 
Okay -- installed FSUIPC into "D:\Program Files\Microsoft Games\Flight Simulator 9\Modules\FSUIPC.DLL" 
"Modules\FSUIPC Documents" folder already exists. 
Now installing additional files into the "Modules\FSUIPC Documents" folder: 
   Installed "FSUIPC User Guide.pdf" okay 
   Installed "FSUIPC for Advanced Users.pdf" okay 
   Installed "FSUIPC History.pdf" okay 
   Installed "List of FS2004 controls.pdf" okay 
   Installed "GlobalSign Root.exe" okay 
   Installed "FSUIPC Lua Library.pdf" okay 
   Installed "FSUIPC Lua Plug-Ins.pdf" okay 
   Installed "Lua License.pdf" okay 
   Installed "Lua Plugins for VRInsight Devices.pdf" okay 
   Installed "Example LUA plugins.zip" okay 
   Installed "SIMSAMURAI+FSUIPC+TUTORIAL.pdf" okay 
FSUIPC.DLL installed and signature checked out okay! 
Deleted GlobalSign Root fix programno longer relevant 
=========================================================== 
All installer tasks completed okay! 
Registration check for FSUIPC was successful! (result code 00) 
*************** End of Install Log *************** 
Thank you!  Carlos Alvarado 
FS9, Winxp SP3