I don't think it will come to that, but it is very suspicious that the SP1 Simconnect is missing, and since SP2/Acceleration is an increment on SP1 and it must be present for a correct installation, not only of SimConnect, but of FSX itself, it does strongly imply that this is where the problems originate.
I think it may be wise to uninstall Acceleration, delete the two later SimConnect folders in Windows WinSxS (not the base one which is okay), then re-install Acceleration. This would not disturb anything else you've added.
Hi Pete,
I haven't got any reference to a SP1 SimmConnect version in my FSUIPC4 Install.log:
.................................
INSTALLATION FOR FSX:
AppPath="H:\Microsoft Flight Simulator X\"
Checking version of FSX.EXE:
... Version 10.0.61637.0 (Need at least 10.0.60905.0)
Checking compatibility with installed SimConnect:
Found SimConnect build 60905 (Original)
Found SimConnect build 61259 (Acc/SP2 Oct07)
Checking if there's already a version of FSUIPC4 installed in:
H:\Microsoft Flight Simulator X\Modules\FSUIPC4.DLL
... Version 4.520 found.
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I have no problem at all with FSX and FSUIPC!