Followed all the instructions to the letter and not only do I have no buildings at KSFO I have lost my GSX and Addon Manager from my top menu.
Since the Flightbeam installers are made by us, and the contains, install and downloads exactly the *same* files from the same URL (our own server) as the one from GSX, so it's not possible this problem could be *caused* by the installer itself.
Instead, what might have caused this, is the antivirus blocking the installation and/or removing the file, because of an update to the antivirus itself.
In going through the troubleshooting scenario I did notice that I do not have a bglmanx.dll file anywhere on my computer. Could this be the problem? Usually not this confused but this one has me puzzled.
The bglmanx.dll file is installed in your FSX (or P3D) root folder.
Assuming you have the option to "see hidden and system files" enabled in Explorer (otherwise you will not see DLLs), if the file is really not there, it only confirms the problem might be caused by the antivirus.
It's not enough to "just" disable the antivirus while downloading and installing. Before launching FSX (IF the antivirus is indeed the problem) you should configure it to exclude the following files from scanning:
YourFSXFolder\bglmanx.dll
YourFSXFolder\fsdreamteam\couatl\Couatl.exe
Or, better yet, exclude the whole FSX folder from scanning, which will give you a benefit in performances.
If, instead, the bglmanx.dll file is there (after reinstalling by properly configuring the antivirus), please confirm this, because the next troubleshooting steps will depend if it's there or not.