I have tried what all 3 posts have suggested, which is making sure that HD textures are enabled, and I turned my anisotropic filtering to x16, but my problem still persists (also none of them mention missing terminals and buildings).
None of the mention missing terminals buildings, because they are a DIFFERENT issue.
BLURRED textures, which is ONE thing you are reporting, are caused by video settings, which is why (since you reported this), I referred to those threads.
If, in ADDITION to blurred textures, you ALSO have "missing buildings", then you have two problems at the same time. Missing buildings, instead, are caused by the software not running.
Also I tried completely disabling my anti virus to solve the problem where it wouldnt copy the files, which worked for GSX, but not for the new version of the addon manager (coutal 3 i think its called).
So, your problem is really "missing buildings", which brings back again to my previous reply, which was based on the rest of your report:
in the installation for the addon manager and GSX, it gives me multiple errors saying it couldnt copy files files from my temp folder into the main FSX directory.
Are you STILL getting errors ? There's no way the software will ever run, if the installation doesn't complete. So, please, if you are STILL getting errors while installing, clearly indicate them.