Ok,   I can confirm the issue. I don't know what happens here, but what the Installer Version 1.05 is installing for Microsoft FSX (expect FSX:SE, can't check it), has nothing to do with what he should install. The Installer 1.05 should only add content to be able to install P3D V4, MS FSX, FSX:SE and P3D V3 was not changed. Here the installer should do he same as 1.04. I also check P3D V3, here it looks for me as expected. I will address this issue tomorrow morning