The readme for fsuipc states: To use FSUIPC7, you must also first copy the SimConnect.dll to the same folder as the FSUIPC7.exe.
The horror of the file structure in MS2020 has a simconnect.dll in 8 different folders. Any idea which I should copy to place in the fsuipc folder?
Make sure you have the latest version of FSUIPC7 as copying that file is no longer required.
Thanks Andy - but are you certain about that? The readme seems quite implicit regarding copying it over. Then again, I could always give it a try, couldn’t I 
He’s correct. No Simconnect needed. You should go download the current version.