Please check that I am not listed as an untrusted publisher in Internet Explorer. FDC tried to install an old version of FSUIPC, but discovered the newer one (4.5.3.0) on my PC, so it didn't.The next thing I get during installation (FSUIPC4 Installer for FSX) is a warning window saying: Problem! My signature check fails on the installed FSUIPC4.DLL. Hi,I have a problem that might be related to Radar Contact or FSUIPC, but I am not completely sure.I installed FDC Live Cockpit V3.90 lately.Installation went fine so far.