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John. this issue has been resolved, and I can installed FSIPC4 in my PC by your advise , Thank you for your assistance and kindness.

*** Moved to main support forum - please take care to post in the corrrect forum for support *** Currently I'm using FSX Acceelation in windows 11 environment, and I have tried to install FSUIPC4 ver 4.977 in my PC, however FSIPC install not completed with error "Checking compatibility with installed SimConnect: ... Failed to find a valid SimConnect needed to use FSUIPC4!", It seems that FSUIPC4 installer cannot find out simconnect.dll I reviewed correct simconnect for FSX has already installed, and I detected the location of simconnect.dll. it has been installted at folder as C:\Windows\WinSxS\Fusion\x86_microsoft.flightsimulator.simconnect_67c7c14424d61b5b_none_7a98ffdea9fe1e16\10.0\10.0.61259.0\ it seems that windows 11 enviroment simconnect install location has been chagned by above one. Can you please modify FSUIPC4 program, it can install in windows 11 envrionment? the attachment contains FSUIPC4 Install log, for your reference. THank you for your help. FSUIPC4 Install.log