NEVER install into the sim with an auto installer.
Always install into a temp directory (so you can see all the files as well as the read-me's) THEN copy those files into the sim.
It will save a lot of blood, sweat, tears & a few #$@% words as well!
I agree.
Some more post wisdom.
Some auto installers refuse to install into a dummy folder. In most cases this is because there is not the FSX.exe file. Copy it there and everything goes right once again. Further problem is that some installer programs refuse to install even after that trick (they possibly look in Windows register). I bypassed this so that I installed FSX to my secondary computer (a laptop - too slow to run FSX but perfect to solve this kind of problems) and installed the addon there and then copied it to the real FSX coputer. I use autoinstaller to install right into the FSX only in some few (payware) cases it is better to do so (for example installing PMDG software). All freeware I install manually (using dummy folder if necessary).
I also take always a full copy of FSX and other sims on my external HDD (or somewhere else) right after it's fresh install. From there it is much easier to copy over missing or corrupted files or folders than try to find those from the original disks. One can also easily compare the original fresh copy and the sim one is using if something is missing.
Pekka