Unable to Install GSX / Standalone Addon Manager

[superem]

So I wanted to try GSX demo with fsx steam. Big mistake

I downloaded the file and tried installing it an got an error 5. Access Denied.

Prior to this all my FSDT sceneries were working.

Now the addon manager in-game tab is gone and sceneries are messed up.

Any scenery I try to reinstall or install I get the code. The only antivirus I have is windows defender. I turned it off during installation

but no help.

[virtuali]

So I wanted to try GSX demo with fsx steam. Big mistake

Obviously not, since GSX works just fine with FSX:SE. In fact, I don't even have the normal FSX installed anymore...

Any scenery I try to reinstall or install I get the code. The only antivirus I have is windows defender. I turned it off during installation

This error can only be caused by one of these two reasons:

- You started the installer too quickly after closing a previous FSX session, without giving a chance for all the files and processes started by it to close down properly.

OR

- An external program, like an antivirus, is denying you access to the install folder. Many users are now aware they run multiple security-related software, so they must be all disabled and configured to exclude the sim folder from scanning.

First, try to reinstall after restarting Windows.

If that doesn't fix it,  even if you are SURE the antivirus it's not running now and you are SURE FSX is not running, it might still have caused a mess in your file permissions, denying you from accessing a folder, while the antivirus was still active.

Yes, it seems strange, but I witnessed this first-hand on an user system during a remote assistance session. There are some free utilities you can try to unlock that folder:

http://www.iobit.com/en/iobit-unlocker.php
http://www.freefileunlocker.com/

And tell to the utility to unlock the FSX\fsdreamteam folder, then REMOVE IT manually, and then REINSTALL GSX.