Sorry for the confusion, I am running FSX-SE.  FSX was installed but uninstalled before I loaded FSX-SE.  Here is the install log 
  
Installer for FSUIPC4.DLL version 4.938f 
Looking in registry for FSX install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0 
     Parameter"SetupPath" 
... >>>  OK! FOUND FSX!  <<< ... 
     SetupPath=C:\Program Files (x86)\Steam\steamapps\common\FSX 
Looking in registry for FSX-SE install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 
     Parameter"SetupPath" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 
     Parameter"AppPath" 
... >>>  OK! FOUND FSX-SE!  <<< ... 
     AppPath=C:\Program Files (x86)\Steam\steamapps\common\FSX\ 
Looking in registry for Prepar3D install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\LockheedMartin\Prepar3D 
     Parameter"SetupPath" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\LockheedMartin\Prepar3D 
     Parameter"AppPath" 
... NOT found! ... 
Looking in registry for Prepar3D v2 install path: 
     HKEY_LOCAL_MACHINE\SOFTWARE\Lockheed Martin\Prepar3D v2 
     Parameter"SetupPath" 
Not there, so looking in: 
     HKEY_CURRENT_USER\SOFTWARE\Lockheed Martin\Prepar3D v2 
     Parameter"AppPath" 
... NOT found! ... 
=========================================================== 
INSTALLATION FOR FSX: 
SetupPath="C:\Program Files (x86)\Steam\steamapps\common\FSX" 
Checking version of the FSX EXE: 
... Version 10.0.62608.0  (Need at least 10.0.60905.0) 
Checking compatibility with installed SimConnect: 
    Found SimConnect build 60905 (Original) 
    Found SimConnect build 62608 (Steam) 
    Found SimConnect build 61242 (SP1 May07) 
Checking if there's already a version of FSUIPC4 installed in: 
       C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL 
... Version 4.938f found. 
FSX Modules folder already exists. 
Okay -- installed FSUIPC4 into "C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL" 
Looking for the current user's Application Data path: 
... found as "C:\Users\piimauna\AppData\Roaming" 
Now finding \Microsoft\FSX\FSX.CFG for all users, including this one 
Looking in "C:\Users\All Users\AppData\Roaming" 
 ... No FSX.CFG there 
Looking in "C:\Users\Default\AppData\Roaming" 
 ... No FSX.CFG there 
Looking in "C:\Users\Default User\AppData\Roaming" 
 ... No FSX.CFG there 
Looking in "C:\Users\piimauna\AppData\Roaming" 
 ... No FSX.CFG there 
Looking in "C:\Users\Public\AppData\Roaming" 
 ... No FSX.CFG there 
Cannot edit the DLL.XML file to activate FSUIPC. 
=========================================================== 
INSTALLATION FOR FSX-SE: 
SetupPath="C:\Program Files (x86)\Steam\steamapps\common\FSX\" 
Checking version of the FSX-SE EXE: 
... Version 10.0.62608.0  (Need at least 10.0.62607.0) 
Checking compatibility with installed SimConnect: 
    Found SimConnect build 60905 (Original) 
    Found SimConnect build 62608 (Steam) 
    Found SimConnect build 61242 (SP1 May07) 
Checking if there's already a version of FSUIPC4 installed in: 
       C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL 
... Version 4.938f found. 
FSX-SE Modules folder already exists. 
Okay -- installed FSUIPC4 into "C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL" 
Looking for the current user's Application Data path: 
... found as "C:\Users\piimauna\AppData\Roaming" 
Now finding \Microsoft\FSX-SE\FSX_SE.CFG for all users, including this one 
Looking in "C:\Users\All Users\AppData\Roaming" 
 ... No FSX_SE.CFG there 
Looking in "C:\Users\Default\AppData\Roaming" 
 ... No FSX_SE.CFG there 
Looking in "C:\Users\Default User\AppData\Roaming" 
 ... No FSX_SE.CFG there 
Looking in "C:\Users\piimauna\AppData\Roaming" 
Found FSX_SE.CFG in "C:\Users\piimauna\AppData\Roaming\Microsoft\FSX-SE\FSX_SE.CFG" 
Now checking DLL.XML ... 
... There is a previous DLL.XML, checking for FSUIPC4 section. 
... FSUIPC4 section already exists but will be replaced. 
     (for FSUIPC4, without Loader) 
... FSUIPC4 section of DLL.XML written okay 
Now checking for a SimConnect.XML file ... 
... No SimConnect.XML file found. This is okay. 
Looking in "C:\Users\Public\AppData\Roaming" 
 ... No FSX_SE.CFG there 
"Modules\FSUIPC Documents" folder already exists. 
Now installing additional files into the "Modules\FSUIPC Documents" folder: 
   Installed "FSUIPC4 User Guide.pdf" okay 
   Installed "FSUIPC4 for Advanced Users.pdf" okay 
   Installed "FSUIPC4 History.pdf" okay 
   Installed "List of FSX and P3D controls.pdf" 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 "LuaFileSystem.pdf" okay 
   Installed "Example LUA plugins.zip" okay 
   Installed "ASN WX Radar facilities in FSUIPC4.pdf" okay 
   Installed "Offset Mapping for PMDG 737NGX.pdf" okay 
   Installed "FSUIPC4 Offsets Status.pdf" okay 
   Installed "Profiles in Separate Files.pdf" okay 
=========================================================== 
All installer tasks completed. 
Registration check for FSUIPC4 was successful! (result code 00) 
*************** End of Install Log ***************